[Java] Applet计算机

这个是2000年初学Java的时候写的了

那时候写个计算机来练习........

 

import java.applet.*;import java.awt.*;import java.awt.event.*;public class cal extends Applet implements ActionListener{/////////////定義資料/////////////////////////////long iFirst=0,iNum=0;int iCal=0;Button bn1=new Button("1"), bn2=new Button("2"), bn3=new Button("3"), bn4=new Button("4"), bn5=new Button("5"), bn6=new Button("6"), bn7=new Button("7"), bn8=new Button("8"), bn9=new Button("9"), bn10=new Button("0"), bnadd=new Button("+"), bnsub=new Button("-"), bnmul=new Button("*"), bneli=new Button("/"), bnequ=new Button("="), bncls=new Button("C");Label lb_show=new Label("***計算機***",Label.RIGHT);Panel p1=new Panel(), p2=new Panel(), p3=new Panel(), p4=new Panel(), p5=new Panel();/////////////////載入//////////////////////////////public void init(){p1.setLayout(new FlowLayout(FlowLayout.CENTER,0,5));p1.add(lb_show);p2.setLayout(new FlowLayout(FlowLayout.CENTER,3,5));p2.add(bn7);p2.add(bn8);p2.add(bn9);p2.add(bneli);p3.setLayout(new FlowLayout(FlowLayout.CENTER,3,5));p3.add(bn4);p3.add(bn5);p3.add(bn6);p3.add(bnmul);p4.setLayout(new FlowLayout(FlowLayout.CENTER,3,5));p4.add(bn1);p4.add(bn2);p4.add(bn3);p4.add(bnsub);p5.setLayout(new FlowLayout(FlowLayout.CENTER,3,5));p5.add(bn10);p5.add(bncls);p5.add(bnequ);p5.add(bnadd);add(p1);add(p2);add(p3);add(p4);add(p5);bn1.addActionListener(this);bn2.addActionListener(this);bn3.addActionListener(this);bn4.addActionListener(this);bn5.addActionListener(this);bn6.addActionListener(this);bn7.addActionListener(this);bn8.addActionListener(this);bn9.addActionListener(this);bn10.addActionListener(this);bnadd.addActionListener(this);bnsub.addActionListener(this);bnmul.addActionListener(this);bneli.addActionListener(this);bnequ.addActionListener(this);bncls.addActionListener(this);}//////////////按鈕事件/////////////////////////////public void actionPerformed(ActionEvent e){if(e.getSource()==bncls){iFirst=0;iNum=0;iCal=0;lb_show.setText("0");}if(e.getSource()==bn1){iNum=iNum*10+1;lb_show.setText(String.valueOf(iNum));}if(e.getSource()==bn2){iNum=iNum*10+2;lb_show.setText(String.valueOf(iNum));}if(e.getSource()==bn3){iNum=iNum*10+3;lb_show.setText(String.valueOf(iNum));}if(e.getSource()==bn4){iNum=iNum*10+4;lb_show.setText(String.valueOf(iNum));}if(e.getSource()==bn5){iNum=iNum*10+5;lb_show.setText(String.valueOf(iNum));}if(e.getSource()==bn6){iNum=iNum*10+6;lb_show.setText(String.valueOf(iNum));}if(e.getSource()==bn7){iNum=iNum*10+7;lb_show.setText(String.valueOf(iNum));}if(e.getSource()==bn8){iNum=iNum*10+8;lb_show.setText(String.valueOf(iNum));}if(e.getSource()==bn9){iNum=iNum*10+9;lb_show.setText(String.valueOf(iNum));}if(e.getSource()==bn10){iNum=iNum*10+0;lb_show.setText(String.valueOf(iNum));}if(e.getSource()==bnadd){iFirst=iNum;iNum=0;iCal=1;}if(e.getSource()==bnsub){iFirst=iNum;iNum=0;iCal=2;}if(e.getSource()==bnmul){iFirst=iNum;iNum=0;iCal=3;}if(e.getSource()==bneli){iFirst=iNum;iNum=0;iCal=4;}if(e.getSource()==bnequ){switch(iCal){case 1: lb_show.setText(String.valueOf(iFirst+iNum)); break;case 2: lb_show.setText(String.valueOf(iFirst-iNum)); break;case 3: lb_show.setText(String.valueOf(iFirst*iNum)); break;case 4: lb_show.setText(String.valueOf(iFirst/iNum)); break;}iFirst=0;iNum=0;iCal=0;}}}