计算器的按钮

import java.awt.Button;
import java.awt.Frame;
import java.awt.GridBagConstraints;
import java.awt.GridBagLayout;
import java.awt.GridLayout;
import java.awt.event.ActionListener;

import javax.swing.JButton;
import javax.swing.JPanel;
import javax.swing.JTextField;

public class TestCalculatorButton
{
private JTextField outputField = new JTextField();
private Frame f = new Frame("测试窗口");
private GridBagLayout gb = new GridBagLayout();
private GridBagConstraints gbc = new GridBagConstraints();
private Button[] buttons= new Button[29];
private String[] buttonnames = { "MC","MR","MS","M+","M-",
"<-", "CE","C","±", "√",
"7", "8", "9", "/", "%",
"4", "5", "6", "*", "1/x",
"1", "2", "3", "-", "=" ,
"00","0",".","+",};

public void init()
{
f.setLayout(gb);
for(int i = 0; i< buttons.length; i++){
buttons[i] = new Button(buttonnames[i]);
}


// gridwidth,gridheight：设置组件横向与纵向的单元格跨越个数。
JButton jbutton = new JButton();
jbutton.setSize(10, 10);

gbc.fill = GridBagConstraints.BOTH;
gbc.weightx = 1; //可以简单理解为组件大小变化的增量值,设置weightx=0时，组件大小不会发生变化。

for(int i=0; i<4; i++){
addButton(buttons[i]);
}
gbc.gridwidth = GridBagConstraints.REMAINDER;
addButton(buttons[4]);
gbc.weightx = 0;

gbc.gridwidth = 1;
for(int i=5; i<9; i++){
addButton(buttons[i]);
}
gbc.gridwidth = GridBagConstraints.REMAINDER;
addButton(buttons[9]);
gbc.weightx = 0;


gbc.gridwidth = 1; //组件占据的行数和列数
for(int i=10; i<14; i++){
addButton(buttons[i]);
}
gbc.gridwidth = GridBagConstraints.REMAINDER;
addButton(buttons[14]);
gbc.weightx = 0;

gbc.gridwidth = 1;
for(int i=15; i<19; i++){
addButton(buttons[i]);
}
gbc.gridwidth = GridBagConstraints.REMAINDER;
addButton(buttons[19]);
gbc.weightx = 0;

gbc.gridwidth = 1;
gbc.gridheight =2;
for(int i=20; i<24; i++){
addButton(buttons[i]);
}
gbc.gridwidth = GridBagConstraints.REMAINDER;
gbc.weightx =0;

addButton(buttons[24]);
// gbc.weightx = 0;
gbc.weighty = 3;

gbc.gridwidth = 1;
for(int i=25; i<28; i++){
addButton(buttons[i]);
}
gbc.gridwidth = GridBagConstraints.REMAINDER;

gbc.weightx = 2;
addButton(buttons[28]);


f.pack();
f.setVisible(true);
}

private void addButton(Button button) {
gb.setConstraints(button, gbc);
f.add(button);
}

public static void main(String[] args){
new TestCalculatorButton().init();
}
}