Java毕业设计之简单易懂计算器+源代码+注释

package proj;


import java.awt.BorderLayout;
import java.awt.Button;
import java.awt.Color;
import java.awt.FlowLayout;
import java.awt.Font;
import java.awt.GridLayout;
import java.awt.HeadlessException;
import java.awt.Insets;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;


import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.JTextArea;
import javax.swing.JTextField;
import javax.swing.event.CaretEvent;
import javax.swing.event.CaretListener;


public class Calculators extends JFrame implements ActionListener, CaretListener {


private JTextField textResult ,textReview;
private JButton btns[]=new JButton[30];
private String str;
public Calculators(String str) {
super(str);
this.setBounds(600, 150, 220, 320);
this.setDefaultCloseOperation(EXIT_ON_CLOSE);
this.setResizable(false);
    this.getContentPane().setBackground(Color.lightGray);
    this.getContentPane().setLayout(new BorderLayout());
        JPanel p1=new JPanel();
        p1.setLayout(new BorderLayout(0, 0));
        textResult=new JTextField("0",5);
        
        textResult.setHorizontalAlignment(JTextField.RIGHT);
        textResult.setFont(new Font("a",Font.BOLD,20));
        textReview=new JTextField(textResult.getText());
        textReview.setHorizontalAlignment(JTextField.RIGHT);
        textReview.setEditable(false);
        textReview.setFont(new Font("v",Font.BOLD,12));
        JPanel p1_north=new JPanel();//设置布局
        p1.add(p1_north,BorderLayout.NORTH);
        JPanel p1_west=new JPanel();
        p1.add(p1_west,BorderLayout.WEST);
        JPanel p1_east=new JPanel();
        p1.add(p1_east,BorderLayout.EAST);
        JPanel ppp=new JPanel();
        ppp.setLayout(new GridLayout(2,1,0,-2));//更加简洁
        ppp.add(textReview);
        ppp.add(textResult);
        p1.add(ppp,BorderLayout.CENTER);
        p1.add(p1_west,BorderLayout.WEST);
        JPanel p1_south=new JPanel();
        p1.add(p1_south,BorderLayout.SOUTH);
    this.getContentPane().add(p1,BorderLayout.NORTH);
   
    JPanel p2=new JPanel();
    p2.setLayout(new GridLayout(6, 5,10,10));
    btns=get(btns);
    for(int i=0;i<btns.length;i++){
    p2.add(btns[i]);
    btns[i].setMargin(new Insets(0, 0, 0, 0));//设置按钮的边缘空余部分为0
    if(i==btns.length -1){
    btns[i].setFont(new Font("b", Font.ROMAN_BASELINE ,12));
    }else{
    btns[i].setFont(new Font("b", Font.ROMAN_BASELINE ,15));
    }
       btns[i].addActionListener(this);//一键事件监听
    }
    this.getContentPane().add(p2,BorderLayout.CENTER);
    JPanel p3=new JPanel();
    this.getContentPane().add(p3,BorderLayout.WEST);
    JPanel p4=new JPanel();
    this.getContentPane().add(p4,BorderLayout.EAST);
    JPanel p5=new JPanel();
    this.getContentPane().add(p5,BorderLayout.SOUTH);
   
    //添加文本监听器
    textResult.addCaretListener(this);
    textReview.addCaretListener(this);
    this.setVisible(true);
   
}


private JButton[] get(JButton[] btns2) {
  btns[0]=new JButton("MC");
  btns[1]=new JButton("MR");
  btns[2]=new JButton("MS");
  btns[3]=new JButton("M+");
  btns[4]=new JButton("M-");
  
  btns[5]=new JButton("←");
  btns[6]=new JButton("CE");
  btns[7]=new JButton("C");
  btns[8]=new JButton("±");
  btns[9]=new JButton("√");
  
  btns[10]=new JButton("7");
  btns[11]=new JButton("8");
  btns[12]=new JButton("9");
  btns[13]=new JButton("/");
  btns[14]=new JButton("%");
  
  btns[15]=new JButton("4");
  btns[16]=new JButton("5");
  btns[17]=new JButton("6");
  btns[18]=new JButton("*");
  btns[19]=new JButton("1/x");
  
  btns[20]=new JButton("1");
  btns[21]=new JButton("2");
  btns[22]=new JButton("3");
  btns[23]=new JButton("-");
  btns[24]=new JButton("x^2");
  
  btns[25]=new JButton("0");
  btns[26]=new JButton(".");
  btns[27]=new JButton("=");
  btns[28]=new JButton("+");
  btns[29]=new JButton("OFF");
return btns;
}




public void actionPerformed(ActionEvent e) {
if(e.getSource()==btns[0]){

}else if(e.getSource()==btns[0]){

}else if(e.getSource()==btns[1]){

}else if(e.getSource()==btns[2]){

}else if(e.getSource()==btns[3]){

}else if(e.getSource()==btns[4]){

}else if(e.getSource()==btns[5]){
str=textResult.getText();
String s="";
if(str.length()==1){
textResult.setText("0");
}else{
for(int i=0;i<str.length()-1;i++){
  s+=""+str.charAt(i);
  }
    System.out.println(str.length());
   textResult.setText(s);
}
  
}else if(e.getSource()==btns[6]){

}else if(e.getSource()==btns[7]){
textResult.setText("0");
textReview.setText("");
}else if(e.getSource()==btns[8]){
math();
String str=textReview.getText();
String s="";
if(str.charAt(0)=='-'){
for(int i=1;i<str.length();i++){
s+=str.charAt(i);
}
textReview.setText(s);
}else{
s="-";
for(int i=0;i<str.length();i++){
s+=str.charAt(i);
}
textReview.setText(s);
}
}else if(e.getSource()==btns[9]){
math();
String str=textResult.getText();
if(!str.equalsIgnoreCase("")){
double s=0;
try {
s=Integer.parseInt(str)*1.0;
s=Math.sqrt(s);

} catch (NumberFormatException e1) {
try {
s=Double.parseDouble(str);
s=Math.sqrt(s);
} catch (NumberFormatException e2) {

}
}
textResult.setText(""+s);
}else{
str=textReview.getText();
double s=0;
try {
s=Integer.parseInt(str);
s=Math.sqrt(s);
} catch (NumberFormatException e1) {
try {
s=Double.parseDouble(str);
s=Math.sqrt(s);
} catch (NumberFormatException e2) {

}
}
textReview.setText(""+s);
}

}else if(e.getSource()==btns[10]){
number(btns[10].getText());
}else if(e.getSource()==btns[11]){
number(btns[11].getText());
}else if(e.getSource()==btns[12]){
number(btns[12].getText());
}else if(e.getSource()==btns[13]){
math();
str=textResult.getText();
String s=textReview.getText();
textReview.setText(s+str+btns[13].getText());
textResult.setText("0");
}else if(e.getSource()==btns[14]){
math();
String str=textResult.getText();
if(!str.equalsIgnoreCase("")){
double s=0;
try {
s=Integer.parseInt(str)*1.00/100;


} catch (NumberFormatException e1) {
try {
s=Double.parseDouble(str)/100;
} catch (NumberFormatException e2) {

}
}
textResult.setText(""+s);
}else{
str=textReview.getText();
double s=0;
try {
s=Integer.parseInt(str)*1.00/100;


} catch (NumberFormatException e1) {
try {
s=Double.parseDouble(str)/100;
} catch (NumberFormatException e2) {

}
}
textReview.setText(""+s);
}

}else if(e.getSource()==btns[15]){
number(btns[15].getText());
}else if(e.getSource()==btns[16]){
number(btns[16].getText());
}else if(e.getSource()==btns[17]){
number(btns[17].getText());
}else if(e.getSource()==btns[18]){
math();
str=textResult.getText();
String s=textReview.getText();
textReview.setText(s+str+btns[18].getText());
textResult.setText("0");
}else if(e.getSource()==btns[19]){
math();
String str=textResult.getText();
if(!str.equalsIgnoreCase("")){
double s=0;
try {
s=Integer.parseInt(str);
s=1.0/s;
} catch (NumberFormatException e1) {
try {
s=Double.parseDouble(str);
s=1.0/s;
} catch (NumberFormatException e2) {

}
}
textResult.setText(""+s);
}else{
str=textReview.getText();
double s=0;
try {
s=Integer.parseInt(str);
s=1.0/s;

} catch (NumberFormatException e1) {
try {
s=Double.parseDouble(str);
s=1.0/s;
} catch (NumberFormatException e2) {

}
}
textReview.setText(""+s);
}
}else if(e.getSource()==btns[20]){
number(btns[20].getText());
}else if(e.getSource()==btns[21]){
number(btns[21].getText());
}else if(e.getSource()==btns[22]){
number(btns[22].getText());
}else if(e.getSource()==btns[23]){
math();
str=textResult.getText();
String s=textReview.getText();
textReview.setText(s+str+btns[23].getText());
textResult.setText("0");
}else if(e.getSource()==btns[24]){
math();
String str=textResult.getText();
if(!str.equalsIgnoreCase("")){
try {
long s=Integer.parseInt(str);
s=s*s;
textResult.setText(""+s);
} catch (NumberFormatException e1) {
try {
double s=Double.parseDouble(str);
s=s*s;
textResult.setText(""+s);
} catch (NumberFormatException e2) {

}

}

}else{
str=textReview.getText();
try {
long s=Integer.parseInt(str);
s=s*s;
textReview.setText(""+s);
} catch (NumberFormatException e1) {
try {
   double s=Double.parseDouble(str);
s=s*s;
textReview.setText(""+s);
} catch (NumberFormatException e2) {

}
}

}
}else if(e.getSource()==btns[25]){
number(btns[25].getText());
}else if(e.getSource()==btns[26]){
str=textResult.getText();
textResult.setText(str+btns[26].getText());
}else if(e.getSource()==btns[27]){
math();
}else if(e.getSource()==btns[28]){
math();
str=textResult.getText();
String s=textReview.getText();
textReview.setText(s+str+btns[28].getText());
textResult.setText("0");
}else if(e.getSource()==btns[29]){
System.exit(0);
}
}


private void math() {
String str=textReview.getText()+textResult.getText();
System.out.println(textReview.getText());

for(int i=1;i<str.length();i++){
if((""+str.charAt(i)).equals("+")){
String[] s=str.split("\\+");
System.out.println(s[0]+"   "+s[1]);
   try {
int sum=Integer.parseInt(s[0])+Integer.parseInt(s[1]);
textResult.setText("");
textReview.setText(""+sum);
} catch (NumberFormatException e1) {
try {
double sum=Double.parseDouble(s[0])+Double.parseDouble(s[1]);
textResult.setText("");
textReview.setText(""+sum);
} catch (NumberFormatException e2) {
e2.printStackTrace();
}
}
}
if((""+str.charAt(i)).equals("-")){
String[] s=str.split("\\-");
if(str.charAt(0)=='-'){
s[s.length-2]="-"+s[s.length-2];
}
   try {
int sum=Integer.parseInt(s[s.length-2])-Integer.parseInt(s[s.length-1]);
textResult.setText("");
textReview.setText(""+sum);
} catch (NumberFormatException e1) {
try {
double sum=Double.parseDouble(s[0])-Double.parseDouble(s[1]);
textResult.setText("");
textReview.setText(""+sum);
} catch (NumberFormatException e2) {

}
}
}
if((""+str.charAt(i)).equals("*")){
String[] s=str.split("\\*");
   try {
int sum=Integer.parseInt(s[0])*Integer.parseInt(s[1]);
textResult.setText("");
textReview.setText(""+sum);
} catch (NumberFormatException e1) {
try {
double sum=Double.parseDouble(s[0])*Double.parseDouble(s[1]);
textResult.setText("");
textReview.setText(""+sum);
} catch (NumberFormatException e2) {
e2.printStackTrace();
}
}
}
if((""+str.charAt(i)).equals("/")){
String[] s=str.split("\\/");
   try {
    if(Integer.parseInt(s[0])%Integer.parseInt(s[1])==0){
    int sum=Integer.parseInt(s[0])/Integer.parseInt(s[1]);
textResult.setText("");
textReview.setText(""+sum);
    }else{
    double sum=1.0*Integer.parseInt(s[0])/Integer.parseInt(s[1]);
textResult.setText("");
textReview.setText(""+sum);
    }

} catch (NumberFormatException e1) {
try {
double sum=Double.parseDouble(s[0])/Double.parseDouble(s[1]);
textResult.setText("");
textReview.setText(""+sum);
} catch (NumberFormatException e2) {
e2.printStackTrace();
}
}
}
}
}

private void number(String text) {
str=textResult.getText();
try {
int s=Integer.parseInt(str);
if(s==0){
textResult.setText(text);
}else{
   textResult.setText(str+text);
}
} catch (NumberFormatException e1) {
try {
double s=Double.parseDouble(str);
textResult.setText(str+text);
} catch (NumberFormatException e2) {
//e2.printStackTrace();
}
}
}


public static void main(String[] args) {
new Calculators("计算器");
}


@Override
public void caretUpdate(CaretEvent e) {
// TODO Auto-generated method stub

}


}