将标签添加到JComboBox和JTextField

Question

嗨我无法将标签添加到我的组合框和textfield.It编译正常，但只显示框但没有标签。

import javax.swing. *; 
import java.awt.event. *; 
import java.awt.FlowLayout;   

public class AreaFrame2 
{ 

    public static void main(String[]args) 
    { 

     //Create array containing shapes 
     String[] shapes ={"(no shape selected)","Circle","Equilateral Triangle","Square"}; 

     //Use combobox to create drop down menu 
     JComboBox comboBox=new JComboBox(shapes); 
     JPanel panel1 = new JPanel(); 
     JLabel label1 = new JLabel("Select shape:"); 
     panel1.add(label1); 
     comboBox.add(panel1); 
     JButton button = new JButton("GO"); 
     JTextField text = new JTextField(20); 

     //Create a JFrame that will be use to put JComboBox into it 
     JFrame frame=new JFrame("Area Calculator Window"); 
     frame.setLayout(new FlowLayout()); //set layout 
     frame.add(comboBox);//add combobox to JFrame 
     text.setLocation(100,100); 
     frame.add(text); 
     frame.add(button); 

     //set default close operation for JFrame 
     frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); 

     //set JFrame ssize 
     frame.setSize(250,250); 

     //make JFrame visible. So we can see it 
     frame.setVisible(true); 

    } 
} 

Answer 1

我认为下面的代码会产生或多或少的你所期望的。

public static void main(String[]args) 
{ 
    //Create array containing shapes 
    String[] shapes ={"(no shape selected)","Circle","Equilateral Triangle","Square"}; 

    //Use combobox to create drop down menu 
    JComboBox comboBox=new JComboBox(shapes); 
    JPanel panel1 = new JPanel(new FlowLayout()); 
    JLabel label1 = new JLabel("Select shape:"); 
    panel1.add(label1); 
    panel1.add(comboBox); 

    JButton button = new JButton("GO"); 
    JTextField text = new JTextField(20); 
    //Create a JFrame that will be use to put JComboBox into it 
    JFrame frame=new JFrame("Area Calculator Window"); 
    frame.setLayout(new FlowLayout()); //set layout 
    frame.add(panel1); 
    frame.add(text); 
    frame.add(button); 
    //set default close operation for JFrame 
    frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); 

    //set JFrame ssize 
    frame.setSize(250,250); 

    //make JFrame visible. So we can see it 
    frame.setVisible(true); 
}