简简单单轻松做，网格布局

做一个没有灵魂的计算器
import javax.swing.;
import java.awt.;
public class WG extends JFrame{
public WG(){

JFrame frame=new JFrame("杜丹丹201831064201");
Container contenPane=frame.getContentPane();
frame.setLayout(new GridLayout(4,4,3,3));

contenPane.add(new JButton("7"));
contenPane.add(new JButton("8"));
contenPane.add(new JButton("9"));
contenPane.add(new JButton("/"));
contenPane.add(new JButton("4"));
contenPane.add(new JButton("5"));
contenPane.add(new JButton("6"));
contenPane.add(new JButton("*"));
contenPane.add(new JButton("1"));
contenPane.add(new JButton("2"));
contenPane.add(new JButton("3"));
contenPane.add(new JButton("-"));
contenPane.add(new JButton("0"));
contenPane.add(new JButton("."));
contenPane.add(new JButton("="));
contenPane.add(new JButton("+"));

frame.setSize(350,200);
frame.setVisible(true);
frame.setDefaultCloseOperation(EXIT_ON_CLOSE);

}
public static void main(String args[]){
new WG();
}

}