📄 jisuanqi.java
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import java.awt.event.*;
import java.awt.*;
import javax.swing.*;
import javax.swing.table.*;
class jisuanqi implements ActionListener{
Frame f;
boolean b=false;boolean B1=false;boolean B2=false;
double d0=0.000;double d1=0.000;
String s,s1;
TextField t;
Button b1,b2,b3,b4,b5,b6,b7,b8,b9,b0,b11,b12,b13,b14,b15,b16,b17;
Panel p1,p2,p3,p4,p5,p6;
jisuanqi(){
s=new String("NULL");
s1=new String("NULL");
f=new Frame("java 计算器");
f.setSize(250,270);
f.addWindowListener(new WindowAdapter()
{ public void windowClosing(WindowEvent e)
{
System.exit(0);
}
});
t=new TextField(10);
t.setText("0");
b1=new Button("1");b1.addActionListener(this);
b2=new Button("2");b2.addActionListener(this);
b3=new Button("3");b3.addActionListener(this);
b4=new Button("4");b4.addActionListener(this);
b5=new Button("5");b5.addActionListener(this);
b6=new Button("6");b6.addActionListener(this);
b7=new Button("7");b7.addActionListener(this);
b8=new Button("8");b8.addActionListener(this);
b9=new Button("9");b9.addActionListener(this);
b0=new Button("0");b0.addActionListener(this);
b11=new Button("+");b11.addActionListener(this);
b12=new Button("-");b12.addActionListener(this);
b13=new Button("*");b13.addActionListener(this);
b14=new Button("/");b14.addActionListener(this);
b15=new Button("=");b15.addActionListener(this);
b16=new Button("退出");b16.addActionListener(this);
b17=new Button("清零");b17.addActionListener(this);
p1=new Panel();
p2=new Panel();
p3=new Panel();
p4=new Panel();
p5=new Panel();
p6=new Panel();
p1.setLayout(new GridLayout(3,4));
p1.add(b7);p1.add(b8);p1.add(b9);p1.add(b14);
p1.add(b6);p1.add(b5);p1.add(b4);p1.add(b13);
p1.add(b1);p1.add(b2);p1.add(b3);p1.add(b12);
p2.setLayout(new GridLayout(1,2));
p2.add(b16);p2.add(b17);
p3.setLayout(new BorderLayout());
p3.add(p2,BorderLayout.NORTH);
p3.add(p1,BorderLayout.CENTER);
p4.setLayout(new BorderLayout());
p4.add(b0,BorderLayout.WEST);
p4.add(b15,BorderLayout.CENTER);
p4.add(b11,BorderLayout.EAST);
p5.setLayout(new BorderLayout());
p5.add(p3,BorderLayout.CENTER);
p5.add(p4,BorderLayout.SOUTH);
p6.setLayout(new BorderLayout());
p6.add(new Label("java 计算器"),BorderLayout.NORTH);
p6.add(t,BorderLayout.CENTER);
p6.add(p5,BorderLayout.SOUTH);
f.add(new Label("operator"),BorderLayout.NORTH);
f.add(p6,BorderLayout.CENTER);
f.show(true);
}
public void actionPerformed(ActionEvent e){
//number button
if(e.getSource()==b1){
if(!(t.getText()).equals("ERROR")){
B1=false;
B2=false;
if(b==true){
b=false;
t.setText("1");
}
else if((t.getText()).equals("0"))
t.setText("1");
else
t.setText(t.getText()+"1");}}
if(e.getSource()==b2){if(!(t.getText()).equals("ERROR")){
B1=false;
B2=false;
if(b==true){
b=false;
t.setText("2");
}
else if((t.getText()).equals("0"))
t.setText("2");
else
t.setText(t.getText()+"2");}}
if(e.getSource()==b3){if(!(t.getText()).equals("ERROR")){
B1=false;
B2=false;
if(b==true){
b=false;
t.setText("3");
}
else if((t.getText()).equals("0"))
t.setText("3");
else
t.setText(t.getText()+"3");}}
if(e.getSource()==b4){if(!(t.getText()).equals("ERROR")){
B1=false;
B2=false;
if(b==true){
b=false;
t.setText("4");
}
else if((t.getText()).equals("0"))
t.setText("4");
else
t.setText(t.getText()+"4");}}
if(e.getSource()==b5){if(!(t.getText()).equals("ERROR")){
B1=false;
B2=false;
if(b==true){
b=false;
t.setText("5");
}
else if((t.getText()).equals("0"))
t.setText("5");
else
t.setText(t.getText()+"5");}}
if(e.getSource()==b6){if(!(t.getText()).equals("ERROR")){
B1=false;
B2=false;
if(b==true){
b=false;
t.setText("6");
}
else if((t.getText()).equals("0"))
t.setText("6");
else
t.setText(t.getText()+"6");}}
if(e.getSource()==b7){if(!(t.getText()).equals("ERROR")){
B1=false;
B2=false;
if(b==true){
b=false;
t.setText("7");
}
else if((t.getText()).equals("0"))
t.setText("7");
else
t.setText(t.getText()+"7");}}
if(e.getSource()==b8){if(!(t.getText()).equals("ERROR")){
B1=false;
B2=false;
if(b==true){
b=false;
t.setText("8");
}
else if((t.getText()).equals("0"))
t.setText("8");
else
t.setText(t.getText()+"8");}}
if(e.getSource()==b9){if(!(t.getText()).equals("ERROR")){
B1=false;
B2=false;
if(b==true){
b=false;
t.setText("9");
}
else if((t.getText()).equals("0"))
t.setText("9");
else
t.setText(t.getText()+"9");}}
if(e.getSource()==b0){if(!(t.getText()).equals("ERROR")){
B1=false;
B2=false;
if(b==true){
b=false;
t.setText("0");
}
else if((t.getText()).equals("0"))
t.setText("0");
else
t.setText(t.getText()+"0");}}
//nulike button
if(e.getSource()==b17){
d0=0.0;d1=0.0;
B1=false;
B2=false;
s="NULL";s1="NULL";b=false;
t.setText("0");}//清零
if(e.getSource()==b11){if(!(t.getText()).equals("ERROR")){
B2=false;
if(B1==true){
d0=Double.parseDouble(t.getText());
s=b11.getLabel();
}
else if(s.equals(b11.getLabel())){
d0=d0+Double.parseDouble(t.getText());
s=b11.getLabel();
B1=true;
b=true;
t.setText(String.valueOf(d0));
}
else if(s.equals(b12.getLabel())){
d0=d0-Double.parseDouble(t.getText());
s=b11.getLabel();
B1=true;
b=true;
t.setText(String.valueOf(d0));
}
else if(s.equals(b13.getLabel())){
d0=d0*Double.parseDouble(t.getText());
s=b11.getLabel();
B1=true;
b=true;
t.setText(String.valueOf(d0));
}
else if(s.equals(b14.getLabel())){
if(Double.parseDouble(t.getText())==0)
t.setText("ERROR");
else
{d0=d0/Double.parseDouble(t.getText());
s=b11.getLabel();
B1=true;
b=true;
t.setText(String.valueOf(d0));}
}
else
{
d0=Double.parseDouble(t.getText());
s=b11.getLabel();
B1=true;
b=true;
}
}}
if(e.getSource()==b12){if(!(t.getText()).equals("ERROR")){
B2=false;
if(B1==true){
d0=Double.parseDouble(t.getText());
s=b12.getLabel();
}
else if(s.equals(b11.getLabel())){
d0=d0+Double.parseDouble(t.getText());
s=b12.getLabel();
B1=true;
b=true;
t.setText(String.valueOf(d0));
}
else if(s.equals(b12.getLabel())){
d0=d0-Double.parseDouble(t.getText());
s=b12.getLabel();
B1=true;
b=true;
t.setText(String.valueOf(d0));
}
else if(s.equals(b13.getLabel())){
d0=d0*Double.parseDouble(t.getText());
s=b12.getLabel();
B1=true;
b=true;
t.setText(String.valueOf(d0));
}
else if(s.equals(b14.getLabel())){
if(Double.parseDouble(t.getText())==0)
t.setText("ERROR");
else
{d0=d0/Double.parseDouble(t.getText());
s=b12.getLabel();
B1=true;
b=true;
t.setText(String.valueOf(d0));}
}
else
{
d0=Double.parseDouble(t.getText());
s=b12.getLabel();
B1=true;
b=true;
}
}}
if(e.getSource()==b13){if(!(t.getText()).equals("ERROR")){
B2=false;
if(B1==true){
d0=Double.parseDouble(t.getText());
s=b13.getLabel();
}
else if(s.equals(b11.getLabel())){
d0=d0+Double.parseDouble(t.getText());
s=b13.getLabel();
B1=true;
b=true;
t.setText(String.valueOf(d0));
}
else if(s.equals(b12.getLabel())){
d0=d0-Double.parseDouble(t.getText());
s=b13.getLabel();
B1=true;
b=true;
t.setText(String.valueOf(d0));
}
else if(s.equals(b13.getLabel())){
d0=d0*Double.parseDouble(t.getText());
s=b13.getLabel();
B1=true;
b=true;
t.setText(String.valueOf(d0));
}
else if(s.equals(b14.getLabel())){
if(Double.parseDouble(t.getText())==0)
t.setText("ERROR");
else
{d0=d0/Double.parseDouble(t.getText());
s=b13.getLabel();
B1=true;
b=true;
t.setText(String.valueOf(d0));}
}
else
{
d0=Double.parseDouble(t.getText());
s=b13.getLabel();
B1=true;
b=true;
}
}}
if(e.getSource()==b14){if(!(t.getText()).equals("ERROR")){
B2=false;
if(B1==true){
d0=Double.parseDouble(t.getText());
s=b14.getLabel();
}
else if(s.equals(b11.getLabel())){
d0=d0+Double.parseDouble(t.getText());
s=b14.getLabel();
B1=true;
b=true;
t.setText(String.valueOf(d0));
}
else if(s.equals(b12.getLabel())){
d0=d0-Double.parseDouble(t.getText());
s=b14.getLabel();
B1=true;
b=true;
t.setText(String.valueOf(d0));
}
else if(s.equals(b13.getLabel())){
d0=d0*Double.parseDouble(t.getText());
s=b14.getLabel();
B1=true;
b=true;
t.setText(String.valueOf(d0));
}
else if(s.equals(b14.getLabel())){
if(Double.parseDouble(t.getText())==0)
t.setText("ERROR");
else
{d0=d0/Double.parseDouble(t.getText());
s=b14.getLabel();
B1=true;
b=true;
t.setText(String.valueOf(d0));}
}
else
{
d0=Double.parseDouble(t.getText());
s=b14.getLabel();
B1=true;
b=true;
}
}}
if(e.getSource()==b15){if(!(t.getText()).equals("ERROR")){
if(B2==true){
if(s1.equals(b11.getLabel())){
d0=d0+d1;
t.setText(String.valueOf(d0));b=true;
}
else if(s1.equals(b12.getLabel())){
d0=d0-d1;
t.setText(String.valueOf(d0));b=true;
}
else if(s1.equals(b13.getLabel())){
d0=d0*d1;
t.setText(String.valueOf(d0));b=true;
}
else if(s1.equals(b14.getLabel())){
d0=d0/d1;
t.setText(String.valueOf(d0));b=true;
}
}
else if(s.equals(b11.getLabel())){
d0=d0+Double.parseDouble(t.getText());
d1=Double.parseDouble(t.getText());
s1=b11.getLabel();s="Null";
B2=true;b=true;
t.setText(String.valueOf(d0));
}
else if(s.equals(b12.getLabel())){
d0=d0-Double.parseDouble(t.getText());
d1=Double.parseDouble(t.getText());
s1=b12.getLabel();s="Null";
B2=true;b=true;
t.setText(String.valueOf(d0));
}
else if(s.equals(b13.getLabel())){
d0=d0*Double.parseDouble(t.getText());
d1=Double.parseDouble(t.getText());
s1=b13.getLabel();s="Null";
B2=true;b=true;
t.setText(String.valueOf(d0));
}
else if(s.equals(b14.getLabel())){
if(Double.parseDouble(t.getText())==0)
t.setText("ERROR");
else
{d0=d0/Double.parseDouble(t.getText());
d1=Double.parseDouble(t.getText());
s1=b14.getLabel();s="NULL";
B2=true;
b=true;
t.setText(String.valueOf(d0));}
}
else
b=true;
}}
if(e.getSource()==b16){
f.setVisible(false);
}
}
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