如何创建用户搜索功能？

-3

我正在Java Swing中创建一个程序，该程序允许用户添加一个学生姓名和他们的成绩，以便稍后拔出。我无法确定如何从保存提交后将学生信息从搜索功能中提取出来。我将发布所有代码，以便您可以查看究竟发生了什么，并突出显示重要部分。有7个班。如何创建用户搜索功能？

的DataModel类

package gradebook; 

    import java.util.ArrayList; 
    import java.util.Iterator; 

    public class DataModel { 

     public ArrayList<Student> students = new ArrayList<Student>(); 

     public void addStudent(Student s){ 

      students.add(s); 
     } 

     public Iterator<Student> getStudents() 
     { 
      return students.iterator(); 
     } 

     public void addGrade(Student s, Grade g){ 

      for (Iterator<Student> iterator = students.iterator(); iterator.hasNext();) { 
       Student ss = (Student) iterator.next(); 
       if(s.getStudentName().equals(ss.getStudentName())) 
       { 
        ss.getGrades().add(g); 
       } 
      } 

     } 
    }

年级

package gradebook; 

public class Grade { 


    public String assignment; 


    public String getAssignment() { 
     return assignment; 
    } 
    public void setAssignment(String assignment) { 
     this.assignment = assignment; 
    } 



}

Student类

package gradebook; 

import java.util.ArrayList; 

public class Student { 

    public String studentName; 


    public ArrayList<Grade> grades = new ArrayList<Grade>(); 

    public String getStudentName() { 
     return studentName; 
    } 
    public void setStudentName(String studentName) { 
     this.studentName = studentName; 
    } 

    public ArrayList<Grade> getGrades() { 
     return grades; 
    } 
    public void setGrades(ArrayList<Grade> grades) { 
     this.grades = grades; 
    } 

}

UIHomeScreen类

package gradebook; 

import java.awt.BorderLayout; 
import java.awt.EventQueue; 
import java.awt.event.ActionEvent; 
import java.awt.event.ActionListener; 
import java.util.Iterator; 

import javax.swing.JFrame; 
import javax.swing.JPanel; 
import javax.swing.border.EmptyBorder; 
import javax.swing.JLabel; 
import javax.swing.JComboBox; 
import javax.swing.DefaultComboBoxModel; 
import javax.swing.JButton; 
import java.awt.Color; 

public class UIHomeScreen extends JFrame { 

    private JPanel contentPane; 
    private DataModel dm = new DataModel(); 

    /** 
    * Launch the application. 
    */ 
    public static void main(String[] args) { 
     EventQueue.invokeLater(new Runnable() { 
      public void run() { 
       new UIHomeScreen().setVisible(true); 
      } 
     }); 
    } 

    /** 
    * Create the frame. 
    */ 
    public UIHomeScreen() { 
     setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); 
     setBounds(100, 100, 450, 300); 
     contentPane = new JPanel(); 
     contentPane.setBorder(new EmptyBorder(5, 5, 5, 5)); 
     setContentPane(contentPane); 
     contentPane.setLayout(null); 

     JLabel gradebookLbl = new JLabel("GradeBook"); 
     gradebookLbl.setBounds(195, 6, 67, 16); 
     contentPane.add(gradebookLbl); 

     JLabel questionLbl = new JLabel("What would you like to do?"); 
     questionLbl.setBounds(146, 72, 169, 16); 
     contentPane.add(questionLbl); 

     JComboBox selectComboBox = new JComboBox(); 
     selectComboBox.setModel(new DefaultComboBoxModel(new String[] {"Select...", "Add Student and Grades", "Select Student to View", "Test"})); 
     selectComboBox.setBounds(156, 100, 142, 27); 
     contentPane.add(selectComboBox); 

     JLabel warningLbl = new JLabel("*"); 
     warningLbl.setVisible(false); 
     warningLbl.setForeground(Color.RED); 
     warningLbl.setBounds(294, 104, 12, 16); 
     contentPane.add(warningLbl); 

     JButton continueBtn = new JButton("Continue"); 
     continueBtn.addActionListener(new ActionListener() { 
      public void actionPerformed(ActionEvent e) { 
       if (selectComboBox.getSelectedItem().equals("Select...")) 
        warningLbl.setVisible(true); 

        if(selectComboBox.getSelectedItem().equals("Add Student and Grades")) 

        { 
         UIStudent studentScreen = new UIStudent(dm); 
         studentScreen.setVisible(true); 
         warningLbl.setVisible(false); 
         } 



        if(selectComboBox.getSelectedItem().equals("Select Student to View")){ 


         UISelectStudent selectStudentScreen = new UISelectStudent(dm); 
         selectStudentScreen.setVisible(true); 
         warningLbl.setVisible(false); 
         } 

        if(selectComboBox.getSelectedItem().equals("Test")){ 


        UIStudentInfo studentInfoScreen= new UIStudentInfo(dm); 
        studentInfoScreen.setVisible(true); 
        warningLbl.setVisible(false); 
        } 

       } 
     }); 
     continueBtn.setBounds(327, 243, 117, 29); 
     contentPane.add(continueBtn); 
    } 

}

UISelectStudent类

package gradebook; 

import java.awt.BorderLayout; 
import java.awt.EventQueue; 
import java.awt.event.ActionEvent; 
import java.awt.event.ActionListener; 
import java.util.Iterator; 

import javax.swing.JFrame; 
import javax.swing.JPanel; 
import javax.swing.border.EmptyBorder; 
import javax.swing.JLabel; 
import javax.swing.JTextField; 
import javax.swing.JButton; 

public class UISelectStudent extends JFrame { 

    private JPanel contentPane; 
    private JTextField enterStudentTxt; 
    DataModel dm; 

    /** 
    * Launch the application. 
    */ 
    public static void main(String[] args) { 
     EventQueue.invokeLater(new Runnable() { 
      public void run() { 
       try { 
        UISelectStudent frame = new UISelectStudent(); 
        frame.setVisible(true); 
       } catch (Exception e) { 
        e.printStackTrace(); 
       } 
      } 
     }); 
    } 

    /** 
    * Create the frame. 
    */ 

    public UISelectStudent(DataModel dm) { 
     this(); 
     this.dm = dm; 




    } 
    public UISelectStudent() { 
     setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); 
     setBounds(100, 100, 450, 300); 
     contentPane = new JPanel(); 
     contentPane.setBorder(new EmptyBorder(5, 5, 5, 5)); 
     setContentPane(contentPane); 
     contentPane.setLayout(null); 

     JLabel gradebookLbl = new JLabel("Gradebook"); 
     gradebookLbl.setBounds(193, 6, 68, 16); 
     contentPane.add(gradebookLbl); 

     JLabel enterStudentLbl = new JLabel("Please enter the student you would like to view"); 
     enterStudentLbl.setBounds(85, 93, 296, 16); 
     contentPane.add(enterStudentLbl); 

     enterStudentTxt = new JTextField(); 
     enterStudentTxt.setBounds(160, 122, 130, 26); 
     contentPane.add(enterStudentTxt); 
     enterStudentTxt.setColumns(10); 

     JButton submitBtn = new JButton("Submit"); 
     submitBtn.addActionListener(new ActionListener() { 
      public void actionPerformed(ActionEvent e) { 


       if (enterStudentTxt.equals(dm.getStudents())){ 

        UIStudentInfo studentInfoScreen = new UIStudentInfo(); 
        studentInfoScreen.setVisible(true); 
       } 
      } 

     }); 
     submitBtn.setBounds(327, 243, 117, 29); 
     contentPane.add(submitBtn); 

     JButton cancelBtn = new JButton("Cancel"); 
     cancelBtn.addActionListener(new ActionListener() { 
      public void actionPerformed(ActionEvent e) { 

       setVisible(false); 

      } 
    }); 
     cancelBtn.setBounds(200, 243, 117, 29); 
     contentPane.add(cancelBtn); 
    } 

}

UIStudent类

package gradebook; 

import java.awt.BorderLayout; 
import java.awt.EventQueue; 
import java.awt.Window; 

import javax.swing.JFrame; 
import javax.swing.JPanel; 
import javax.swing.border.EmptyBorder; 
import javax.swing.JLabel; 
import javax.swing.JOptionPane; 
import javax.swing.JTextField; 
import javax.swing.JButton; 
import java.awt.event.ActionListener; 
import java.util.ArrayList; 
import java.awt.event.ActionEvent; 


public class UIStudent extends JFrame { 

    private JPanel contentPane; 
    private JTextField studentNameTxt; 
    private DataModel dm; 
    private JTextField ass1Txt; 
    private JTextField ass3Txt; 
    private JTextField ass5Txt; 
    private JTextField ass2Txt; 
    private JTextField ass4Txt; 
    private JLabel ass3Lbl; 
    private JLabel ass2Lbl; 
    private JLabel ass4Lbl; 
    private JLabel ass5Lbl; 
    private JTextField ass6Txt; 

    /** 
    * Create the frame. 
    */ 
    public UIStudent(DataModel dm) { 
     this(); 
     this.dm = dm; 

    } 

    public UIStudent() { 
     setDefaultCloseOperation(JFrame.HIDE_ON_CLOSE); 
     setBounds(100, 100, 450, 300); 
     contentPane = new JPanel(); 
     contentPane.setBorder(new EmptyBorder(5, 5, 5, 5)); 
     setContentPane(contentPane); 
     contentPane.setLayout(null); 

     JLabel gradebookLbl = new JLabel("Gradebook"); 
     gradebookLbl.setBounds(197, 6, 68, 16); 
     contentPane.add(gradebookLbl); 

     JLabel addStudentLbl = new JLabel("Add Student"); 
     addStudentLbl.setBounds(197, 34, 77, 16); 
     contentPane.add(addStudentLbl); 

     JLabel nameLbl = new JLabel("Student Name:"); 
     nameLbl.setBounds(69, 67, 92, 16); 
     contentPane.add(nameLbl); 

     studentNameTxt = new JTextField(); 
     studentNameTxt.setBounds(173, 62, 215, 26); 
     contentPane.add(studentNameTxt); 
     studentNameTxt.setColumns(10); 

     JButton submitBtn = new JButton("Submit"); 
     submitBtn.addActionListener(new ActionListener() { 
      public void actionPerformed(ActionEvent e) { 
       Student s = new Student(); 
       s.setStudentName(studentNameTxt.getText()); 
       dm.addStudent(s); 

       Grade g = new Grade(); 
       g.setAssignment(ass1Txt.getText()); 
       dm.addGrade(s, g); 

       g = new Grade(); 
       g.setAssignment(ass2Txt.getText()); 
       dm.addGrade(s, g); 

       g = new Grade(); 
       g.setAssignment(ass3Txt.getText()); 
       dm.addGrade(s, g); 

       g = new Grade(); 
       g.setAssignment(ass4Txt.getText()); 
       dm.addGrade(s, g); 

       g = new Grade(); 
       g.setAssignment(ass5Txt.getText()); 
       dm.addGrade(s, g); 

       g = new Grade(); 
       g.setAssignment(ass6Txt.getText()); 
       dm.addGrade(s, g); 


       setVisible(false); 
      } 
     }); 
     submitBtn.setBounds(327, 245, 117, 29); 
     contentPane.add(submitBtn); 

     ass1Txt = new JTextField(); 
     ass1Txt.setBounds(173, 117, 41, 26); 
     contentPane.add(ass1Txt); 
     ass1Txt.setColumns(10); 

     JLabel ass1Lbl = new JLabel("Assignment 1:"); 
     ass1Lbl.setBounds(69, 122, 92, 16); 
     contentPane.add(ass1Lbl); 

     ass3Txt = new JTextField(); 
     ass3Txt.setBounds(173, 153, 41, 26); 
     contentPane.add(ass3Txt); 
     ass3Txt.setColumns(10); 

     ass5Txt = new JTextField(); 
     ass5Txt.setBounds(173, 187, 41, 26); 
     contentPane.add(ass5Txt); 
     ass5Txt.setColumns(10); 

     ass2Txt = new JTextField(); 
     ass2Txt.setBounds(347, 117, 41, 26); 
     contentPane.add(ass2Txt); 
     ass2Txt.setColumns(10); 

     ass4Txt = new JTextField(); 
     ass4Txt.setBounds(347, 153, 41, 26); 
     contentPane.add(ass4Txt); 
     ass4Txt.setColumns(10); 

     ass3Lbl = new JLabel("Assignment 3:"); 
     ass3Lbl.setBounds(69, 158, 92, 16); 
     contentPane.add(ass3Lbl); 

     ass2Lbl = new JLabel("Assignment 2:"); 
     ass2Lbl.setBounds(243, 122, 92, 16); 
     contentPane.add(ass2Lbl); 

     ass4Lbl = new JLabel("Assignment 4:"); 
     ass4Lbl.setBounds(243, 158, 92, 16); 
     contentPane.add(ass4Lbl); 

     ass5Lbl = new JLabel("Assignment 5:"); 
     ass5Lbl.setBounds(69, 192, 92, 16); 
     contentPane.add(ass5Lbl); 

     JButton cancelBtn = new JButton("Cancel"); 
     cancelBtn.addActionListener(new ActionListener() { 
      public void actionPerformed(ActionEvent e) { 

       setVisible(false); 

      } 
    }); 
     cancelBtn.setBounds(214, 245, 117, 29); 
     contentPane.add(cancelBtn); 

     JLabel ass6Lbl = new JLabel("Assignment 6:"); 
     ass6Lbl.setBounds(243, 191, 92, 16); 
     contentPane.add(ass6Lbl); 

     ass6Txt = new JTextField(); 
     ass6Txt.setColumns(10); 
     ass6Txt.setBounds(347, 187, 41, 26); 
     contentPane.add(ass6Txt); 

    } 
}

UIStudentInfo类

package gradebook; 

import java.awt.BorderLayout; 
import java.awt.EventQueue; 

import javax.swing.JFrame; 
import javax.swing.JPanel; 
import javax.swing.border.EmptyBorder; 
import javax.swing.JLabel; 
import javax.swing.JTextField; 
import javax.swing.ComboBoxModel; 
import javax.swing.DefaultComboBoxModel; 
import javax.swing.JButton; 
import javax.swing.JComboBox; 
import java.awt.event.ActionListener; 
import java.util.Iterator; 
import java.awt.event.ActionEvent; 

public class UIStudentInfo extends JFrame { 

    private JPanel contentPane; 
    private JTextField studentNameTxt; 
    private JTextField ass1Txt; 
    private JTextField ass3Txt; 
    private JTextField ass5Txt; 
    private JTextField ass2Txt; 
    private JTextField ass4Txt; 
    DataModel dm; 
    private JLabel ass6Lbl; 
    private JTextField ass6Txt; 
    private JLabel gradebookLbl; 
    private JLabel viewingStudentGradesLbl; 
    private JButton exitBtn; 


    /** 
    * Create the frame. 
    */ 
    public UIStudentInfo(DataModel dm){ 
     this(); 
     this.dm = dm; 

     Student s = new Student(); 
     for (Iterator<Student> iterator = dm.getStudents(); iterator.hasNext();) { 
      s = (Student) iterator.next(); 
     } 

     studentNameTxt.setText(s.getStudentName()); 

     ass1Txt.setText("" + s.getGrades().get(0).getAssignment()); 
     ass2Txt.setText("" + s.getGrades().get(1).getAssignment()); 
     ass3Txt.setText("" + s.getGrades().get(2).getAssignment()); 
     ass4Txt.setText("" + s.getGrades().get(3).getAssignment()); 
     ass5Txt.setText("" + s.getGrades().get(4).getAssignment()); 
     ass6Txt.setText("" + s.getGrades().get(5).getAssignment()); 


    } 
    public UIStudentInfo() { 
     setDefaultCloseOperation(JFrame.HIDE_ON_CLOSE); 
     setBounds(100, 100, 450, 300); 
     contentPane = new JPanel(); 
     contentPane.setBorder(new EmptyBorder(5, 5, 5, 5)); 
     setContentPane(contentPane); 
     contentPane.setLayout(null); 

     JLabel studentNameLbl = new JLabel("Student Name:"); 
     studentNameLbl.setBounds(69, 67, 92, 16); 
     contentPane.add(studentNameLbl); 

     studentNameTxt = new JTextField(); 
     studentNameTxt.setEditable(false); 
     studentNameTxt.setBounds(173, 62, 215, 26); 
     contentPane.add(studentNameTxt); 
     studentNameTxt.setColumns(10); 

     JLabel ass1Lbl = new JLabel("Assignment 1:"); 
     ass1Lbl.setBounds(69, 122, 92, 16); 
     contentPane.add(ass1Lbl); 

     ass1Txt = new JTextField(); 
     ass1Txt.setBounds(173, 117, 41, 26); 
     contentPane.add(ass1Txt); 
     ass1Txt.setColumns(10); 

     JLabel ass3Lbl = new JLabel("Assignment 3:"); 
     ass3Lbl.setBounds(69, 158, 92, 16); 
     contentPane.add(ass3Lbl); 

     ass3Txt = new JTextField(); 
     ass3Txt.setColumns(10); 
     ass3Txt.setBounds(173, 153, 41, 26); 
     contentPane.add(ass3Txt); 

     JLabel ass5Lbl = new JLabel("Assignment 5:"); 
     ass5Lbl.setBounds(69, 192, 92, 16); 
     contentPane.add(ass5Lbl); 

     ass5Txt = new JTextField(); 
     ass5Txt.setColumns(10); 
     ass5Txt.setBounds(173, 187, 41, 26); 
     contentPane.add(ass5Txt); 

     JLabel ass2Lbl = new JLabel("Assignment 2:"); 
     ass2Lbl.setBounds(243, 122, 92, 16); 
     contentPane.add(ass2Lbl); 

     ass2Txt = new JTextField(); 
     ass2Txt.setColumns(10); 
     ass2Txt.setBounds(347, 117, 41, 26); 
     contentPane.add(ass2Txt); 

     JLabel ass4Lbl = new JLabel("Assignment 4:"); 
     ass4Lbl.setBounds(243, 158, 92, 16); 
     contentPane.add(ass4Lbl); 

     ass4Txt = new JTextField(); 
     ass4Txt.setColumns(10); 
     ass4Txt.setBounds(347, 153, 41, 26); 
     contentPane.add(ass4Txt); 


     ass6Lbl = new JLabel("Assignment 6:"); 
     ass6Lbl.setBounds(243, 191, 92, 16); 
     contentPane.add(ass6Lbl); 

     ass6Txt = new JTextField(); 
     ass6Txt.setBounds(347, 187, 41, 26); 
     contentPane.add(ass6Txt); 
     ass6Txt.setColumns(10); 

     gradebookLbl = new JLabel("Gradebook"); 
     gradebookLbl.setBounds(204, 6, 68, 16); 
     contentPane.add(gradebookLbl); 

     viewingStudentGradesLbl = new JLabel("Viewing Student's Grades"); 
     viewingStudentGradesLbl.setBounds(162, 34, 162, 16); 
     contentPane.add(viewingStudentGradesLbl); 

     exitBtn = new JButton("Exit"); 
     exitBtn.addActionListener(new ActionListener() { 
      public void actionPerformed(ActionEvent e) { 

       setVisible(false); 
      } 
     }); 
     exitBtn.setBounds(327, 243, 117, 29); 
     contentPane.add(exitBtn); 
    } 
}

我想要做的是，当我打这个在输入名称后提交按钮enterStudentTxt Text Field它将检查并查看它是否等于我以前从UIStudent类提交的学生名称。我在这里做了一个if语句，但我相信我会以错误的方式去做，因为它没有做任何事情。

JButton submitBtn = new JButton("Submit"); 
     submitBtn.addActionListener(new ActionListener() { 
      public void actionPerformed(ActionEvent e) { 


       if (enterStudentTxt.equals(dm.getStudents())){ 

        UIStudentInfo studentInfoScreen = new UIStudentInfo(); 
        studentInfoScreen.setVisible(true); 
       } 
      } 

     });

这是从UIStudent类保存学生名称的代码。我需要抓取保存在这里的studentNameTxt，并通过用户输入使其能够再次拉起来。

JButton submitBtn = new JButton("Submit"); 
     submitBtn.addActionListener(new ActionListener() { 
      public void actionPerformed(ActionEvent e) { 
       Student s = new Student(); 
       s.setStudentName(studentNameTxt.getText()); 
       dm.addStudent(s); 

       Grade g = new Grade(); 
       g.setAssignment(ass1Txt.getText()); 
       dm.addGrade(s, g); 

       g = new Grade(); 
       g.setAssignment(ass2Txt.getText()); 
       dm.addGrade(s, g); 

       g = new Grade(); 
       g.setAssignment(ass3Txt.getText()); 
       dm.addGrade(s, g); 

       g = new Grade(); 
       g.setAssignment(ass4Txt.getText()); 
       dm.addGrade(s, g); 

       g = new Grade(); 
       g.setAssignment(ass5Txt.getText()); 
       dm.addGrade(s, g); 

       g = new Grade(); 
       g.setAssignment(ass6Txt.getText()); 
       dm.addGrade(s, g); 


       setVisible(false); 
      } 
     });

对不起，如果有一些不清楚，我很新编程。随意提出问题以清除某些信息。但基本上，我试图创建一个数据库来存储我输入的所有这些学生，并能够通过用户输入的文本进行搜索来重新获得它们。我能够将信息备份到最近输入的位置，但我希望能够将每个学生分开并搜索它们，并逐个提取他们的成绩。我觉得我已经接近完成了这一点，但是我错过了一些关键要素来完成。谢谢你的时间。

来源

2016-04-24 adabun

为了更快得到更好的帮助，请发布[MCVE]或[简短，独立，正确的示例]（http://www.sscce.org/）。 –

*“如何创建用户搜索功能？”*使用具有'RowSorter'的'JTable'。有关详细信息，请参见[如何使用表格：排序和过滤]（https://docs.oracle.com/javase/tutorial/uiswing/components/table.html#sorting）。 –

您已将输入字符串与学生姓名的迭代器进行比较;你需要做的是搜索现有的学生为新的名字。

> enterStudentTxt.equals(dm.getStudents())

尝试编写一个检查重复名称函数，该函数返回该学生是否已经存在于数据模型实例中。东西的效果：

public boolean checkDuplicateName(String name) 
{ 
// check the whole ArrayList for a student with the same name 
    for(Student s : students) 
    { 
     // compare the actual name strings 
     if (s.studentName.equals(name)) return true; 
    } 
    return false; 
}

包含在数据模型类，功能，请确保调用它，你管理按下按钮。

JButton submitBtn = new JButton("Submit"); 
     submitBtn.addActionListener(new ActionListener() { 
      public void actionPerformed(ActionEvent e) { 

       if (checkDuplicate(enterStudentTxt)){ 
        UIStudentInfo studentInfoScreen = new UIStudentInfo(); 
        studentInfoScreen.setVisible(true); 
       } 
      } 

     });

我希望这有助于在按下按钮时发生某些事情。我没有检查你的用户界面代码，但我注意到你的搜索错误。

来源

2016-04-24 02:33:59 thedevelop3r

如何创建用户搜索功能？

回答

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