java se，求教

Question

本帖最后由 yxs1112003 于 2011-10-13 18:23:14 编辑

Answer 1

这样可以了。。package com.yhy.test;import java.awt.GridLayout;import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JTextField;public class mult{ public static void main(String[] args) {
ShowGridLayout frame = new ShowGridLayout(); frame.setTitle("GirdLayout");
frame.setLocationRelativeTo(null);
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setVisible(true);
frame.setSize(200, 200); }}
class ShowGridLayout extends JFrame {
public ShowGridLayout() {
setLayout(new GridLayout(2, 2, 5, 5)); add(new JTextField(5));
add(new JTextField(5));
add(new JButton("*"));
add(new JButton("=")); }
}

Answer 2

package com.yhy.test;import java.awt.GridLayout;import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JTextField;public class mult { public static void main(String[] args) {
mult m = new mult();
ShowGridLayout frame = m.new ShowGridLayout();//实例化一个嵌套类的方法
frame.setTitle("GirdLayout");
frame.setLocationRelativeTo(null);
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setVisible(true);
frame.setSize(200, 200);
}
 public class ShowGridLayout extends JFrame {
public ShowGridLayout() {
setLayout(new GridLayout(2, 2, 5, 5));

add(new JTextField(5));
add(new JTextField(5));
add(new JButton("*"));
add(new JButton("="));

}
}
}

Answer 3

说下LZ的代码，有点受力不讨好。在Mult类内定义内部类 ShowGridLayout 。但还是按照LZ的代码改成可运行的。import java.awt.GridLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JTextField;
public class Mult {static public class ShowGridLayout extends JFrame
{
public ShowGridLayout()
{
setLayout(new GridLayout(2,2,5,5));add(new JTextField(5));
add(new JTextField(5));
add(new JButton("*"));
add(new JButton("="));}
} 
public static void main(String[]args)
{
ShowGridLayout frame = new ShowGridLayout();frame.setTitle("GirdLayout");
frame.setLocationRelativeTo(null);
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setVisible(true);
frame.setSize(200,200);}}我觉得LZ的代码最好是改成下面这种形式：代码如下：
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JTextField;
import java.awt.GridLayout;public class Mult {
public static void main(String[] args) {

ShowGridLayout sd = new ShowGridLayout();
sd.init();
}
}class ShowGridLayout extends JFrame {

//定义一个初始化方法
    public void init() {
    
        this.setLayout(new GridLayout(2,2,5,5));
      
        this.add(new JTextField(5));
        this.add(new JTextField(5));
        this.add(new JButton("*"));
        this.add(new JButton("="));
        
        this.setSize(200,200);
        this.setTitle("GirdLayout");
        this.setLocationRelativeTo(null);
        this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        this.setVisible(true);
       
    }
}代码不明白为什么的话，可以再问我，很乐意为你解答，希望这些能帮到LZ