简易计算器(java实现).doc

//此计算器能够进行简单的加减乘除运算，界面如下：

package计算器;

importjava.awt.GridLayout;
importjava.awt.event.ActionEvent;
importjava.awt.event.ActionListener;
importjavax.swing.JButton;
importjavax.swing.JFrame;
importjavax.swing.JLabel;
importjavax.swing.JPanel;
importjavax.swing.JTextArea;

classCalcimplementsActionListener{
JFrameframe=newJFrame("计算器");
JPanelpan=newJPanel(newGridLayout(4,4,20,30));
JTextAreaxianshi=newJTextArea(1,20);
JLabellab1=newJLabel("结果：");
JButton[]number=newJButton[10];
JButtonplus=newJButton("+");
JButtonreduce=newJButton("-");
JButtonmulti=newJButton("*");
JButtondivide=newJButton("/");
JButtonpoint=newJButton(".");
JButtonequals=newJButton("=");
JButtonreset=newJButton("重置");

floatnum1=0,num2=0;
booleanflag=false;
intt=0;
inttemp=0; //temp记录每次按下键的类型

publicvoidjisuan(){
for(inti=0;i<=9;i++){
number[i]=newJButton(Integer.toString(i));
pan.add(number[i]);
number[i].addActionListener(this);
}
pan.add(point);
pan.add(equals);
pan.add(plus);
pan.add(reduce);
pan.add(multi);
pan.add(divide);
lab1.setBounds(30,10,80,20);
xianshi.setBounds(100,10,200,20);
reset.setBounds(310,10,60,30);
pan.setBounds(10,50,360,360);
this.frame.setLayout(null);
this.frame.add(xianshi);
this.frame.add(pan);
this.frame.add(lab1);
this.frame.add(reset);
this.frame.setBounds(400,200,400,500);
this.frame.setVisible(true);
xianshi.setEditable(false);
xianshi.setText("0");
point.addActionListener(this);
equals.addActionListener(this);
plus.addActionListener(this);
reduce.addActionListener(this);
multi.addActionListener(this);
divide.addActionListener(this);
reset.addActionListener(newActionListener(){
@Override
publicvoidactionPerformed(ActionEventarg0){
xianshi.setText("0");
num1=num2=0;
t=0;
flag=false;
}
});
}
@Override
publicvoidactionPerformed(ActionEventarg0){
Stringn=xianshi.getText();
for(inti=0;i<=9;i++){
if(arg0.getSource()==number[i]){
if((xianshi.ge