计算器JAVA源代码这是我在培训班时，学了一个月后编写的一个简易计算器的源代码。

从设计、编码、实现该程序共用时一天（10个小时）。

当时只是学完了JAVA的基础知识，各位也看得出，这里面没有用到高深的技术，全是基础的，所以我当时理解的就是：编程主要需要的是解决问题的思维、思想！现将其公布，希望能给初学者一点起示：[注：将考贝后，在JDK环境下可直接运行][源代码]import java.awt.*;import java.awt.event.*;import javax.swing.*;import java.util.*;class Jsqzj implements ActionListener{JButton b1,b2,b3,b4,b5,b6,b7,b8,b9,b10,b11,b12,b13,b14,b15,b16;JFrame f;GridLayout c=new GridLayout(4,4);JTextField tf = new JTextField();public void init(){f=new JFrame("CardLayout testing");Container ct = f.getContentPane();tf.setHorizontalAlignment(JTextField.RIGHT);ct.add(tf,"North");JPanel p2=new JPanel();ct.add(p2,"Center");GridLayout c=new GridLayout(4,4);p2.setLayout(c);JButton b1,b2,b3,b4,b5,b6,b7,b8,b9,b10,b11,b12,b13,b14,b15,b16;b1=new JButton("1");b2=new JButton("2");b3=new JButton("3");b4=new JButton("4");b5=new JButton("5");b6=new JButton("6");b7=new JButton("7");b8=new JButton("8");b9=new JButton("9");b10=new JButton("0");b11=new JButton(".");b12=new JButton("=");b13=new JButton("+");b14=new JButton("-");b15=new JButton("x");b16=new JButton("/");p2.add(b1);b1.addActionListener(this); p2.add(b2);b2.addActionListener(this); p2.add(b3);b3.addActionListener(this); p2.add(b13);b13.addActionListener(this); p2.add(b4);b4.addActionListener(this); p2.add(b5);b5.addActionListener(this); p2.add(b6);b6.addActionListener(this); p2.add(b14);b14.addActionListener(this); p2.add(b7);b7.addActionListener(this); p2.add(b8);b8.addActionListener(this);p2.add(b9);b9.addActionListener(this);p2.add(b15);b15.addActionListener(this);p2.add(b10);b10.addActionListener(this);p2.add(b11);b11.addActionListener(this);p2.add(b12);b12.addActionListener(this);p2.add(b16);b16.addActionListener(this);f.addWindowListener(new WindowAdapter(){public void windowClosing(WindowEvent e){System.exit(0);}});f.setSize(200,180);f.setVisible(true);}double sum=0;Vector v=new Vector(1,1);Vector v2=new Vector(1,1);public Jsqzj(){v2.addElement(new String("init"));v.addElement(new String("init"));}public void actionPerformed(ActionEvent e){String str=tf.getText();if(e.getActionCommand()=="+") //加号的实现；{if(("+").equals((String)stElement()) ||("-").equals((String)stElement()) ||("x").equals((String)stElement()) ||("/").equals((String)stElement()) ||("=").equals((String)stElement())){tf.setText(String.valueOf(sum));}else if(("init").equals((String)stElement())){tf.setText(String.valueOf(sum));v2.addElement(new String("="));}else{double d=Double.parseDouble(str);if (("+").equals((String)stElement())){sum=sum+d;tf.setText(String.valueOf(sum));}else if (("-").equals((String)stElement())){sum=sum-d;tf.setText(String.valueOf(sum));}elseif(("x").equals((String)stElement())){sum=sum*d;tf.setText(String.valueOf(sum ));}elseif(("/").equals((String)stElement())){sum=sum/d;tf.setText(Stri ng.valueOf(sum));}elseif(("=").equals((String)stElement())){sum=sum+d ;tf.setTex t(String.valueOf(sum));}else{sum=sum+d;tf.setText(String.valueOf(sum));}}v.addElement(new String("+"));v2.addElement(new String("+"));}if(e.getActionCommand()=="-")//减号的实现；{if(("+").equals((String)stElement()) ||("-").equals((String)stElement()) ||("x").equals((String)stElement()) ||("/").equals((String)stElement()) ||("=").equals((String)stElement())){tf.setText(String.valueOf(sum));}else if(("init").equals((String)stElement())){tf.setText(String.valueOf(sum));v2.addElement(new String("="));}else{double d=Double.parseDouble(str);if (("+").equals((String)stElement())){sum=sum+d;tf.setText(String.valueOf(sum));}else if (("-").equals((String)stElement())){sum=sum-d;tf.setText(String.valueOf(sum));}elseif(("x").equals((String)stElement())){sum=sum*d;tf.setText(String.valueOf(sum ));}elseif(("/").equals((String)stElement())){sum=sum/d;tf.setText(Stri ng.valueOf(sum));}elseif(("=").equals((String)stElement())){sum=sum+d ;tf.setTex t(String.valueOf(sum));}else{sum=sum+d;tf.setText(String.valueOf(sum));}}v.addElement(new String("-"));v2.addElement(new String("-"));}if(e.getActionCommand()=="x") //乘号的实现；{if(("+").equals((String)stElement()) ||("-").equals((String)stElement()) ||("x").equals((String)stElement()) ||("/").equals((String)stElement()) ||("=").equals((String)stElement())){tf.setText(String.valueOf(sum));}else if(("init").equals((String)stElement())){tf.setText(String.valueOf(sum));v2.addElement(new String("="));}else{double d=Double.parseDouble(str);if (("+").equals((String)stElement())){sum=sum+d;tf.setText(String.valueOf(sum));}else if (("-").equals((String)stElement())){sum=sum-d;tf.setText(String.valueOf(sum));}elseif(("x").equals((String)stElement())){sum=sum*d;tf.setText(String.valueOf(sum ));}elseif(("/").equals((String)stElement())){sum=sum/d;tf.setText(Stri ng.valueOf(sum));}elseif(("=").equals((String)stElement())){sum=sum+d ;tf.setText(String.valueOf(sum));}else{sum=sum+d;tf.setTex t(String.valueOf(sum));}}v.addElement(new String("x"));v2.addElement(new String("x"));}if(e.getActionCommand()=="/") //除号的实现；{if(("+").equals((String)stElement()) ||("-").equals((String)stElement()) ||("x").equals((String)stElement()) ||("/").equals((String)stElement()) ||("=").equals((String)stElement())){tf.setText(String.valueOf(sum));}else if(("init").equals((String)stElement())){tf.setText(String.valueOf(sum));v2.addElement(new String("="));}else{double d=Double.parseDouble(str);if (("+").equals((String)stElement())){sum=sum+d;tf.setText(String.valueOf(sum));}else if (("-").equals((String)stElement())){sum=sum-d;tf.setText(String.valueOf(sum));}elseif(("x").equals((String)stElement())){sum=sum*d;tf.setText(String.valueOf(sum));}elseif(("/").equals((String)stElement())){sum=sum/d;tf.setText(Stri ng.valueOf(sum));}elseif(("=").equals((String)stElement())){sum=sum+d ;tf.setText(String.valueOf(sum));}else{sum=sum+d;tf.setText(String.valueOf(sum));}}v.addElement(new String("/"));v2.addElement(new String("/"));}if (e.getActionCommand()=="=" ) //等号实现；{if(("+").equals((String)stElement()) ||("-").equals((String)stElement()) ||("x").equals((String)stElement()) ||("/").equals((String)stElement()) ||("=").equals((String)stElement()) ){tf.setText(String.valueOf(sum));}else if(("init").equals((String)stElement())){tf.setText(String.valueOf(sum));}else{double d=Double.parseDouble(str);if (("+").equals((String)stElement())){sum=sum+d;tf.setText(String.valueOf(sum));}else if (("-").equals((String)stElement())){sum=sum-d;tf.setText(String.valueOf(sum));}elseif(("x").equals((String)stElement())){sum=sum*d;tf.setText(String.valueOf(sum ));}elseif(("/").equals((String)stElement())){sum=sum/d;tf.setText(Stri ng.valueOf(sum));}elseif(("=").equals((String)stElement())){sum=sum +d;tf.setText(String.valueOf(sum));//tf.setT ext(String.valueOf(sum));}else{sum=sum+d;tf.setText(String.valueOf(sum));}}v.addElement(new String("="));v2.addElement(new String("="));}if (e.getActionCommand()=="1"||e.getActionCommand()=="2" ||e.getActionCommand()=="3" ||e.getActionCommand()=="4" ||e.getActionCommand()=="5" ||e.getActionCommand()=="6" ||e.getActionCommand()=="7" ||e.getActionCommand()=="8" ||e.getActionCommand()=="9" ||e.getActionCommand()=="0" ||e.getActionCommand()==".") // 1，2，3，4，5，6，7，8，9，0，.的实现；{if(("+").equals((String)stElement()) ||("-").equals((String)stElement()) ||("x").equals((String)stElement()) ||("/").equals((String)stElement()) ||("init").equals((String)stElement())){tf.setText("");tf.setText(e.getActionCommand());}else if (("=").equals((String)stElement())){sum=0;tf.setText("");tf.setText(e.getActionCommand());}else{tf.setText(tf.getText()+e.getActionCommand());//调用其父类中的getText()方法}v2.addElement(new String(e.getActionCommand()));}}public static void main(String args[]){new Jsqzj().init();}}。