在ArrayList中的对象中搜索字符串/ Int

Question

我试图在对象（ProductInfo）中搜索字符串（名称）或/和整数（ID）的数组（库存）。之后，名称，ID，号码和描述将显示在4个单独的标签（NameOut，IDOut，Num Out，DesOut）中。我不知道如何做到这一点。任何帮助表示赞赏。

NameGo是我的名字搜索按钮，IDGo是按ID搜索的按钮。

/* 
* To change this template, choose Tools | Templates 
* and open the template in the editor. 
*/ 

import java.util.*; 

/** 
* 
* @author matthewmurchison 
*/ 
public class mVentory extends javax.swing.JFrame { 

    /** 
    * Creates new form mVentory 
    */ 
     public mVentory() { 
     initComponents(); 

    } 

     public class ProductInfo{ 
        String name; 
        String des; 
        int ID; 
        int num; 


    public ProductInfo(String name, String des, int ID, int num){ 
     this.name = name; 
     this.des =des; 
     this.ID = ID; 
     this.num = num; 
    } 
} 


     /** 
    * 
    */ 
    public static void Inventory(){ 

     } 


    //creat Array 
     ArrayList <ProductInfo> Inventory = new ArrayList <ProductInfo>(); 

    /** 
    * This method is called from within the constructor to initialize the form. 
    * WARNING: Do NOT modify this code. The content of this method is always 
    * regenerated by the Form Editor. 
    */ 
    @SuppressWarnings("unchecked") 
    // <editor-fold defaultstate="collapsed" desc="Generated Code">       
    private void initComponents() { 

     jLabel1 = new javax.swing.JLabel(); 
     jLabel2 = new javax.swing.JLabel(); 
     jLabel3 = new javax.swing.JLabel(); 
     jLabel4 = new javax.swing.JLabel(); 
     jLabel5 = new javax.swing.JLabel(); 
     jLabel6 = new javax.swing.JLabel(); 
     jLabel7 = new javax.swing.JLabel(); 
     NameIn = new javax.swing.JTextField(); 
     IDIn = new javax.swing.JTextField(); 
     DesIn = new javax.swing.JTextField(); 
     NumIn = new javax.swing.JTextField(); 
     NameSearch = new javax.swing.JTextField(); 
     IDSearch = new javax.swing.JTextField(); 
     NameOut = new javax.swing.JLabel(); 
     IDOut = new javax.swing.JLabel(); 
     DesOut = new javax.swing.JLabel(); 
     NumOut = new javax.swing.JLabel(); 
     jLabel14 = new javax.swing.JLabel(); 
     jLabel15 = new javax.swing.JLabel(); 
     jLabel16 = new javax.swing.JLabel(); 
     AddGo = new javax.swing.JButton(); 
     NameGo = new javax.swing.JButton(); 
     IDGo = new javax.swing.JButton(); 

     setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE); 

     jLabel1.setText("jLabel1"); 

     jLabel2.setText("Name:"); 

     jLabel3.setText("ID"); 

     jLabel4.setText("Descripion"); 

     jLabel5.setText("Number"); 

     jLabel6.setText("Name"); 

     jLabel7.setText("ID"); 

     NameIn.setText("jTextField1"); 

     IDIn.setText("jTextField2"); 
     IDIn.addActionListener(new java.awt.event.ActionListener() { 
      public void actionPerformed(java.awt.event.ActionEvent evt) { 
       IDInActionPerformed(evt); 
      } 
     }); 

     DesIn.setText("jTextField3"); 

     NumIn.setText("jTextField4"); 

     NameSearch.setText("jTextField5"); 

     IDSearch.setText("jTextField6"); 

     NameOut.setText("jLabel10"); 

     IDOut.setText("jLabel11"); 

     DesOut.setText("jLabel12"); 

     NumOut.setText("jLabel13"); 

     jLabel14.setText("Add"); 

     jLabel15.setText("Search by Name"); 

     jLabel16.setText("Search by ID"); 

     AddGo.setText("jButton1"); 
     AddGo.addActionListener(new java.awt.event.ActionListener() { 
      public void actionPerformed(java.awt.event.ActionEvent evt) { 
       AddGoActionPerformed(evt); 
      } 
     }); 

     NameGo.setText("jButton2"); 
     NameGo.addActionListener(new java.awt.event.ActionListener() { 
      public void actionPerformed(java.awt.event.ActionEvent evt) { 
       NameGoActionPerformed(evt); 
      } 
     }); 

     IDGo.setText("jButton3"); 
     IDGo.addActionListener(new java.awt.event.ActionListener() { 
      public void actionPerformed(java.awt.event.ActionEvent evt) { 
       IDGoActionPerformed(evt); 
      } 
     }); 

     org.jdesktop.layout.GroupLayout layout = new org.jdesktop.layout.GroupLayout(getContentPane()); 
     getContentPane().setLayout(layout); 
     layout.setHorizontalGroup(
      layout.createParallelGroup(org.jdesktop.layout.GroupLayout.LEADING) 
      .add(org.jdesktop.layout.GroupLayout.TRAILING, layout.createSequentialGroup() 
       .add(0, 0, Short.MAX_VALUE) 
       .add(layout.createParallelGroup(org.jdesktop.layout.GroupLayout.LEADING) 
        .add(AddGo) 
        .add(layout.createParallelGroup(org.jdesktop.layout.GroupLayout.LEADING) 
         .add(org.jdesktop.layout.GroupLayout.TRAILING, layout.createSequentialGroup() 
          .add(jLabel14) 
          .add(233, 233, 233)) 
         .add(org.jdesktop.layout.GroupLayout.TRAILING, layout.createSequentialGroup() 
          .add(jLabel15) 
          .add(222, 222, 222)) 
         .add(org.jdesktop.layout.GroupLayout.TRAILING, layout.createSequentialGroup() 
          .add(jLabel16) 
          .add(230, 230, 230))))) 
      .add(layout.createSequentialGroup() 
       .add(layout.createParallelGroup(org.jdesktop.layout.GroupLayout.LEADING) 
        .add(layout.createParallelGroup(org.jdesktop.layout.GroupLayout.TRAILING) 
         .add(layout.createParallelGroup(org.jdesktop.layout.GroupLayout.LEADING) 
          .add(layout.createSequentialGroup() 
           .add(225, 225, 225) 
           .add(jLabel1)) 
          .add(layout.createSequentialGroup() 
           .add(99, 99, 99) 
           .add(layout.createParallelGroup(org.jdesktop.layout.GroupLayout.LEADING) 
            .add(jLabel7) 
            .add(jLabel6))) 
          .add(layout.createSequentialGroup() 
           .add(126, 126, 126) 
           .add(layout.createParallelGroup(org.jdesktop.layout.GroupLayout.TRAILING) 
            .add(IDGo) 
            .add(layout.createSequentialGroup() 
             .add(NameOut) 
             .add(18, 18, 18) 
             .add(IDOut) 
             .add(18, 18, 18) 
             .add(DesOut))) 
           .add(18, 18, 18) 
           .add(NumOut))) 
         .add(layout.createSequentialGroup() 
          .addContainerGap() 
          .add(layout.createParallelGroup(org.jdesktop.layout.GroupLayout.TRAILING) 
           .add(layout.createParallelGroup(org.jdesktop.layout.GroupLayout.LEADING) 
            .add(jLabel2) 
            .add(layout.createSequentialGroup() 
             .add(layout.createParallelGroup(org.jdesktop.layout.GroupLayout.LEADING) 
              .add(jLabel4) 
              .add(jLabel5) 
              .add(jLabel3)) 
             .add(18, 18, 18) 
             .add(layout.createParallelGroup(org.jdesktop.layout.GroupLayout.LEADING) 
              .add(NameSearch, org.jdesktop.layout.GroupLayout.PREFERRED_SIZE, 207, org.jdesktop.layout.GroupLayout.PREFERRED_SIZE) 
              .add(layout.createParallelGroup(org.jdesktop.layout.GroupLayout.LEADING, false) 
               .add(DesIn) 
               .add(NumIn) 
               .add(NameIn) 
               .add(IDIn, org.jdesktop.layout.GroupLayout.PREFERRED_SIZE, 202, org.jdesktop.layout.GroupLayout.PREFERRED_SIZE))))) 
           .add(IDSearch, org.jdesktop.layout.GroupLayout.PREFERRED_SIZE, 207, org.jdesktop.layout.GroupLayout.PREFERRED_SIZE)))) 
        .add(layout.createSequentialGroup() 
         .add(220, 220, 220) 
         .add(NameGo))) 
       .addContainerGap(144, Short.MAX_VALUE)) 
     ); 
     layout.setVerticalGroup(
      layout.createParallelGroup(org.jdesktop.layout.GroupLayout.LEADING) 
      .add(layout.createSequentialGroup() 
       .addContainerGap() 
       .add(jLabel1) 
       .addPreferredGap(org.jdesktop.layout.LayoutStyle.RELATED, 31, Short.MAX_VALUE) 
       .add(jLabel14) 
       .add(18, 18, 18) 
       .add(layout.createParallelGroup(org.jdesktop.layout.GroupLayout.BASELINE) 
        .add(jLabel2) 
        .add(NameIn, org.jdesktop.layout.GroupLayout.PREFERRED_SIZE, org.jdesktop.layout.GroupLayout.DEFAULT_SIZE, org.jdesktop.layout.GroupLayout.PREFERRED_SIZE)) 
       .addPreferredGap(org.jdesktop.layout.LayoutStyle.RELATED) 
       .add(layout.createParallelGroup(org.jdesktop.layout.GroupLayout.BASELINE) 
        .add(jLabel3) 
        .add(IDIn, org.jdesktop.layout.GroupLayout.PREFERRED_SIZE, org.jdesktop.layout.GroupLayout.DEFAULT_SIZE, org.jdesktop.layout.GroupLayout.PREFERRED_SIZE)) 
       .addPreferredGap(org.jdesktop.layout.LayoutStyle.RELATED) 
       .add(layout.createParallelGroup(org.jdesktop.layout.GroupLayout.BASELINE) 
        .add(jLabel4) 
        .add(DesIn, org.jdesktop.layout.GroupLayout.PREFERRED_SIZE, org.jdesktop.layout.GroupLayout.DEFAULT_SIZE, org.jdesktop.layout.GroupLayout.PREFERRED_SIZE)) 
       .addPreferredGap(org.jdesktop.layout.LayoutStyle.RELATED) 
       .add(layout.createParallelGroup(org.jdesktop.layout.GroupLayout.TRAILING) 
        .add(NumIn, org.jdesktop.layout.GroupLayout.PREFERRED_SIZE, org.jdesktop.layout.GroupLayout.DEFAULT_SIZE, org.jdesktop.layout.GroupLayout.PREFERRED_SIZE) 
        .add(jLabel5)) 
       .addPreferredGap(org.jdesktop.layout.LayoutStyle.RELATED) 
       .add(AddGo) 
       .add(18, 18, 18) 
       .add(jLabel15) 
       .add(24, 24, 24) 
       .add(layout.createParallelGroup(org.jdesktop.layout.GroupLayout.BASELINE) 
        .add(NameSearch, org.jdesktop.layout.GroupLayout.PREFERRED_SIZE, org.jdesktop.layout.GroupLayout.DEFAULT_SIZE, org.jdesktop.layout.GroupLayout.PREFERRED_SIZE) 
        .add(jLabel6)) 
       .add(18, 18, 18) 
       .add(NameGo) 
       .add(14, 14, 14) 
       .add(jLabel16) 
       .add(18, 18, 18) 
       .add(layout.createParallelGroup(org.jdesktop.layout.GroupLayout.BASELINE) 
        .add(IDSearch, org.jdesktop.layout.GroupLayout.PREFERRED_SIZE, org.jdesktop.layout.GroupLayout.DEFAULT_SIZE, org.jdesktop.layout.GroupLayout.PREFERRED_SIZE) 
        .add(jLabel7)) 
       .add(18, 18, 18) 
       .add(IDGo) 
       .add(32, 32, 32) 
       .add(layout.createParallelGroup(org.jdesktop.layout.GroupLayout.BASELINE) 
        .add(NameOut) 
        .add(IDOut) 
        .add(DesOut) 
        .add(NumOut)) 
       .add(64, 64, 64)) 
     ); 

     pack(); 
    }// </editor-fold>       

    private void IDInActionPerformed(java.awt.event.ActionEvent evt) {          
     // TODO add your handling code here: 
    }          

    private void IDGoActionPerformed(java.awt.event.ActionEvent evt) {          
     // Search by ID 

    }          

    private void AddGoActionPerformed(java.awt.event.ActionEvent evt) {          
    // Add Item 
     String Name, Description; 
     int Identification, Number; 

     Name = NameIn.getText(); 
     Description = DesIn.getText(); 
     Identification = Integer.parseInt(IDIn.getText()); 
     Number = Integer.parseInt(NumIn.getText()); 

     Inventory.add(new ProductInfo(Name, Description, Identification, Number)); 

     NameIn.setText(""); 
     DesIn.setText(""); 
     IDIn.setText(""); 
     NumIn.setText(""); 


    }          

    private void NameGoActionPerformed(java.awt.event.ActionEvent evt) {          
       // Search by Name 
    }          

    /** 
    * @param args the command line arguments 
    */ 
    public static void main(String args[]) { 
     /* Set the Nimbus look and feel */ 
     //<editor-fold defaultstate="collapsed" desc=" Look and feel setting code (optional) "> 
     /* If Nimbus (introduced in Java SE 6) is not available, stay with the default look and feel. 
     * For details see http://download.oracle.com/javase/tutorial/uiswing/lookandfeel/plaf.html 
     */ 
     try { 
      for (javax.swing.UIManager.LookAndFeelInfo info : javax.swing.UIManager.getInstalledLookAndFeels()) { 
       if ("Nimbus".equals(info.getName())) { 
        javax.swing.UIManager.setLookAndFeel(info.getClassName()); 
        break; 
       } 
      } 
     } catch (ClassNotFoundException ex) { 
      java.util.logging.Logger.getLogger(mVentory.class.getName()).log(java.util.logging.Level.SEVERE, null, ex); 
     } catch (InstantiationException ex) { 
      java.util.logging.Logger.getLogger(mVentory.class.getName()).log(java.util.logging.Level.SEVERE, null, ex); 
     } catch (IllegalAccessException ex) { 
      java.util.logging.Logger.getLogger(mVentory.class.getName()).log(java.util.logging.Level.SEVERE, null, ex); 
     } catch (javax.swing.UnsupportedLookAndFeelException ex) { 
      java.util.logging.Logger.getLogger(mVentory.class.getName()).log(java.util.logging.Level.SEVERE, null, ex); 
     } 
     //</editor-fold> 

     /* Create and display the form */ 
     java.awt.EventQueue.invokeLater(new Runnable() { 
      public void run() { 
       new mVentory().setVisible(true); 
      } 
     }); 
    } 
    // Variables declaration - do not modify      
    private javax.swing.JButton AddGo; 
    private javax.swing.JTextField DesIn; 
    private javax.swing.JLabel DesOut; 
    private javax.swing.JButton IDGo; 
    private javax.swing.JTextField IDIn; 
    private javax.swing.JLabel IDOut; 
    private javax.swing.JTextField IDSearch; 
    private javax.swing.JButton NameGo; 
    private javax.swing.JTextField NameIn; 
    private javax.swing.JLabel NameOut; 
    private javax.swing.JTextField NameSearch; 
    private javax.swing.JTextField NumIn; 
    private javax.swing.JLabel NumOut; 
    private javax.swing.JLabel jLabel1; 
    private javax.swing.JLabel jLabel14; 
    private javax.swing.JLabel jLabel15; 
    private javax.swing.JLabel jLabel16; 
    private javax.swing.JLabel jLabel2; 
    private javax.swing.JLabel jLabel3; 
    private javax.swing.JLabel jLabel4; 
    private javax.swing.JLabel jLabel5; 
    private javax.swing.JLabel jLabel6; 
    private javax.swing.JLabel jLabel7; 
    // End of variables declaration     
} 

Answer 1

都说ProductInfo结构如下：

public class ProductInfo { 

    private int id; 
    private String name; 
    private Foo someOtherField; 

    public int getId() { 
     return id; 
    } 

    public String getName() { 
     return name; 
    } 

    //... 

} 

然后你就可以搜索一个ArrayList<ProductInfo>，使用下面的代码：

public class Inventory { 

    private ArrayList<ProductInfo> pis = new ArrayList<productInfo>(); 

    public ProductInfo find (int id, String name) { 
     for(ProductInfo pi : pis) { 
      if(pi.getId() == id && Objects.Equals(pi.getName(),name)) { 
       return pi; 
      } 
     } 
    } 

} 

这个方法也许应该由Inventory被privided因为控制器模式明确指出您应该separ从数据操作中吃掉用户界面。

---

可以使用取从JTextField实例的数据：

String name = NameIn.getText(); 
int id = Integer.Parse(IDIn.getText()); 

---

最后，你会当用户触发事件需要一些应该做的工作处理方法：

public class ButtonHandler implements ActionListener { 

    private Inventory inventory; 
    private JTextField idIn; 
    private JTextField nameIn; 

    public ButtonHandler(Inventory inventory, JTextField idIn, JTextField nameIn) { 
     this.inventory = inventory; 
     this.idIn = idIn; 
     this.nameIn = nameIn; 
    } 

    public void actionPerformed(ActionEvent e) { 
     String name = NameIn.getText(); 
     int id = Integer.Parse(IDIn.getText()); 
     ProductInfo pi = inventory.find(name,id); 
     //do something with pi 
    } 
} 

您将需要创建此类处理程序，并添加侦听器：

ButtonHandler handler = new ButtonHandler(inventory,this.IDIn,this.NameIn); 
someButton.addActionListener(this); 

---

最后几个Java编码指南：

• 一个字段的名称总是以小写字母开头。
• 如前所述，使用不同的类，分离责任，并明确将用户界面与数据操作分开。