急需这段java程序的注释！！！答的好补分（二）

来源：百度知道 编辑：UC知道 时间：2024/06/19 17:55:02
private void addButton(String label,int row,int column,int with,int height,ActionListener listener) {

JButton button=new JButton(label);
constraints.gridx=row;
constraints.gridy=column;
constraints.gridwidth=with;
constraints.gridheight=height;
constraints.fill=GridBagConstraints.BOTH;
button.addActionListener(listener);
layout.setConstraints(button,constraints);
container.add(button); }
private class InsertAction implements ActionListener {
public void actionPerformed(ActionEvent event) {
String input=event.getActionCommand();
if (start) {
displayField.setText("");
start=false;
if(input.equals("+/-"))
displayField.setText(displayField.getText()+"-"); }
if(!input.equals("+/-")) {
if(input.equals("Backspace")) {
String str=displayField.getText();
if(str.length()>0)
displayField.setText(str.substring

// 加入按键，参数是
// 按键显示内容
// 坐标（row,column）
// 所占空间（就是格）（width,height）
// 所属button的监听
private void addButton(String label, int row, int column, int with,
int height, ActionListener listener) {

JButton button = new JButton(label);
constraints.gridx = row;
constraints.gridy = column;
constraints.gridwidth = with;
constraints.gridheight = height;
constraints.fill = GridBagConstraints.BOTH;
button.addActionListener(listener);
layout.setConstraints(button, constraints);
container.add(button);
}

//输入监听
private class InsertAction implements ActionListener {
public void actionPerformed(ActionEvent event) {
String input = event.getActionCommand();
// 如果是默认状态
if (start) {
//先是结果为空
displayField.setText("");
//改为false
start = false;
//如果输入的是负号
if (input.equals("+/-")