Cómo utilizar el lenguaje de objetos Java para escribir una calculadora de suma, resta, multiplicación y división con código
El siguiente nombre de archivo debe ser: JiSuanQi.java
import?java.awt.*;
import?java.awt.event.*;
p>
clase pública?JiSuanQi
{
String?s="",s1=null,s2=null;
Marco?f =nuevo?Marco("Calculadora"); TextField?tf=nuevo?TextField(30); Panel?p1=nuevo?Panel(); =nuevo?Panel( ); Botón?bt1=nuevo?Botón("="); Botón?bt2=nuevo?Botón("Eliminar"); 0;
público?static?void?main(String[]?args)
{
nuevo?JiSuanQi().init(); p>
}
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.añadir(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",".","Restablecer","/ "}; p>
for(int?i=0;i<16;i++)
{
bt[i]=nuevo?Botón(b[ i]);
p2.add(bt[i]);
}
bt[0].setForeground(Color.blue); p>
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].s
etForeground(Color.blue);
bt[3].setForeground(Color.red);
bt[7].setForeground(Color.red);
bt[11].setForeground(Color.rojo);
bt[15].setForeground(Color.rojo);
bt[14].setForeground(Color.rojo );
bt1.setForeground(Color.rojo);
bt2.setForeground(Color.rojo);
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);
} p>
}
p>
}
); bt[1].addActionListener(new?ActionListener()
{ p>
public?void?actionPerformed(ActionEvent? e)
{ s+=2; tf.setText(s);
}
}
);
bt[2].addActionListener(new?ActionListener()
{
public?void ?actionPerformed(ActionEvent?e)
{ s+=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; tf.setText(s);
p>{ p>
}
}
);
bt[12].addActionListener(new?ActionListener() p>
{
public?void?actionPerformed(ActionEvent?e)
{ s+=0; tf.setText(s);
}
}
p>
}
);
bt[13].addActionListener(new? ActionListener()
{
público ?void?actionPerformed(ActionEvent?e)
{ s+='.'; setText(s);
}
}
);
bt[3].addActionListener(new?ActionListener()
{
público?void?actionPerformed (ActionEvent?e)
{ s1=s; ; tf.setText(s);
}
}
);
bt[7].addActionListener(new?ActionListener ()
{
público? void?actionPerformed(ActionEvent?e)
{ s1=s; =""; tf.setText(s);
}
}
);
bt[11].addActionListener( new?ActionListener()
{
public?void?actionPerformed(ActionEvent?e)
{ s1=s+='*'; 3; s2=""; tf.setText(s);
}
}
);
bt[14] .addActionListener(new?ActionListener()
{
publ
ic?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.parseDouble(s2); double?c=0; cambiar(id) {
caso?1:c=a+b;?break;
caso?2:c =a-b;?break;
caso?3:c=a*b;?break;
caso?4:c=a/b;?break }? p>
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(); para(int?i=0;i s1=s } if(s2.length()>=1) { char[]?c3 ; char[]?c4=new?char[s2.length()-1]; c3=s2.toCharArray(); para(int?i=0;i tf.setText(s); } } ); } }