下面文件名要為：JiSuanQi.java
import?java.awt.*;
import?java.awt.event.*;
public?class?JiSuanQi
{
String?s="",s1=null,s2=null;
Frame?f=new?Frame("計算器");
TextField?tf=new?TextField(30); Panel?p1=new?Panel(); Panel?p2=new?Panel(); Panel?p3=new?Panel(); Button?bt1=new?Button("="); Button?bt2=new?Button("刪除"); Button[]?bt=new?Button[16]; int?id=0;public?static?void?main(String[]?args)
{
new?JiSuanQi().init();
}
public?void?init()
{
f.setBackground(new?Color(85,247,253));
f.setLayout(new?BorderLayout(4,4));
p2.setLayout(new?GridLayout(4,4,4,4));
p3.setLayout(new?BorderLayout(4,4));
f.setResizable(false);
f.add(p1,BorderLayout.NORTH);
f.add(p2);
p3.add(bt2,BorderLayout.NORTH);
p3.add(bt1);
p1.add(tf);
f.add(p3,BorderLayout.EAST);
String[]?b={"1","2","3","+","4","5","6","-","7","8","9","*","0",".","復位","/"};
for(int?i=0;i<16;i++)
{
bt[i]=new?Button(b[i]);
p2.add(bt[i]);
}
bt[0].setForeground(Color.blue);
bt[1].setForeground(Color.blue);
bt[2].setForeground(Color.blue);
bt[4].setForeground(Color.blue);
bt[5].setForeground(Color.blue);
bt[6].setForeground(Color.blue);
bt[8].setForeground(Color.blue);
bt[9].setForeground(Color.blue);
bt[10].setForeground(Color.blue);
bt[12].setForeground(Color.blue);
bt[13].setForeground(Color.blue);
bt[3].setForeground(Color.red);
bt[7].setForeground(Color.red);
bt[11].setForeground(Color.red);
bt[15].setForeground(Color.red);
bt[14].setForeground(Color.red);
bt1.setForeground(Color.red);
bt2.setForeground(Color.red);
f.pack();
f.setVisible(true);
f.addWindowListener(new?WindowAdapter()
{
public?void?windowClosing(WindowEvent?e) { System.exit(0);? }?}
);
bt[0].addActionListener(new?ActionListener()
{
public?void?actionPerformed(ActionEvent?e)
{
s+=1; s2+=1; tf.setText(s);}
}
);
bt[1].addActionListener(new?ActionListener(){
public?void?actionPerformed(ActionEvent?e)
{
s+=2; s2+=2; tf.setText(s);}
}
);
bt[2].addActionListener(new?ActionListener()
{
public?void?actionPerformed(ActionEvent?e)
{
s+=3; s2+=3; tf.setText(s);}
}
);
bt[4].addActionListener(new?ActionListener()
{
public?void?actionPerformed(ActionEvent?e)
{
s+=4; s2+=4; tf.setText(s);}
}
);
bt[5].addActionListener(new?ActionListener()
{
public?void?actionPerformed(ActionEvent?e)
{
s+=5; s2+=5; tf.setText(s);}
}
);
bt[6].addActionListener(new?ActionListener()
{
public?void?actionPerformed(ActionEvent?e)
{
s+=6; s2+=6; tf.setText(s);}
}
);
bt[8].addActionListener(new?ActionListener()
{
public?void?actionPerformed(ActionEvent?e)
{
s+=7; s2+=7; tf.setText(s);}
}
);
bt[9].addActionListener(new?ActionListener()
{
public?void?actionPerformed(ActionEvent?e)
{
s+=8; s2+=8; tf.setText(s);}
}
);
bt[10].addActionListener(new?ActionListener()
{
public?void?actionPerformed(ActionEvent?e)
{
s+=9; s2+=9; tf.setText(s);}
}
);
bt[12].addActionListener(new?ActionListener()
{
public?void?actionPerformed(ActionEvent?e)
{
s+=0; s2+=0; tf.setText(s);}
}
);
bt[13].addActionListener(new?ActionListener()
{
public?void?actionPerformed(ActionEvent?e)
{
s+='.'; s2+='.'; tf.setText(s);}
}
);
bt[3].addActionListener(new?ActionListener()
{
public?void?actionPerformed(ActionEvent?e)
{
s1=s; s+='+'; id=1; s2=""; tf.setText(s);}
}
);
bt[7].addActionListener(new?ActionListener()
{
public?void?actionPerformed(ActionEvent?e)
{
s1=s; s+='-'; id=2; s2=""; tf.setText(s);}
}
);
bt[11].addActionListener(new?ActionListener()
{
public?void?actionPerformed(ActionEvent?e)
{
s1=s; s+='*'; id=3; s2=""; tf.setText(s);}
}
);
bt[14].addActionListener(new?ActionListener()
{
public?void?actionPerformed(ActionEvent?e)
{
s=""; s2=""; tf.setText(s);}
}
);
bt[15].addActionListener(new?ActionListener()
{
public?void?actionPerformed(ActionEvent?e)
{
s1=s; s+='/'; id=4; s2=""; tf.setText(s);}
}
);
bt1.addActionListener(new?ActionListener()
{
public?void?actionPerformed(ActionEvent?e)
{
if(id<1)?;else{
s+='='; double?a=Double.parseDouble(s1); double?b=Double.parseDouble(s2); double?c=0; switch(id) {case?1:c=a+b;?break;
case?2:c=a-b;?break;
case?3:c=a*b;?break;
case?4:c=a/b;?break;
}?s+=c;?
tf.setText(s);
}?
s="";s1="";s2="";id=0;}
}
);
bt2.addActionListener(new?ActionListener()
{
public?void?actionPerformed(ActionEvent?e)
{?
char[]?c1; char[]?c2=new?char[s.length()-1]; c1=s.toCharArray(); for(int?i=0;i<s.length()-1;i++) c2[i]=c1[i]; s=s.valueOf(c2);? if(id<1) {s1=s;
}if(s2.length()>=1)
{
char[]?c3; char[]?c4=new?char[s2.length()-1]; c3=s2.toCharArray(); for(int?i=0;i<s2.length()-1;i++) c4[i]=c3[i]; s2=s2.valueOf(c4); }?tf.setText(s);
}
}
);
}
}