java计算器源代码用java代码编写个计算器代码:

求JAVA简单计算器代码

展开全部 import java.awt.*; import java.awt.event.*; import javax.swing.*; public class testZ extends JFrame implements ActionListener{ private JPanel jPanel1,jPanel2; private JTextField resultField; private JButton s1,s2,s3,s4,s5,s6,s7,s8,s9,s0,b1,b2,b3,b4,f1,f2; private boolean end,add,sub,mul,div; private String str; private double num1,num2; public testZ(){ super("计算器"); setSize(300,240); Container con=getContentPane(); con.setLayout(new BorderLayout()); jPanel1=new JPanel(); jPanel1.setLayout(new GridLayout(1,1)); jPanel2=new JPanel(); jPanel2.setLayout(new GridLayout(4,4)); resultField=new JTextField("0"); jPanel1.add(resultField); con.add(jPanel1,BorderLayout.NORTH); s1=new JButton(" 1 "); s1.addActionListener(this); s2=new JButton(" 2 "); s2.addActionListener(this); s3=new JButton(" 3 "); s3.addActionListener(this); s4=new JButton(" 4 "); s4.addActionListener(this); s5=new JButton(" 5 "); s5.addActionListener(this); s6=new JButton(" 6 "); s6.addActionListener(this); s7=new JButton(" 7 "); s7.addActionListener(this); s8=new JButton(" 8 "); s8.addActionListener(this); s9=new JButton(" 9 "); s9.addActionListener(this); s0=new JButton(" 0 "); s0.addActionListener(this); b1=new JButton(" + "); b1.addActionListener(this); b2=new JButton(" - "); b2.addActionListener(this); b3=new JButton(" * "); b3.addActionListener(this); b4=new JButton(" / "); b4.addActionListener(this); f1=new JButton(" . "); f1.addActionListener(this); f2=new JButton(" = "); f2.addActionListener(this); jPanel2.add(s1); jPanel2.add(s2); jPanel2.add(s3); jPanel2.add(b1); jPanel2.add(s4); jPanel2.add(s5); jPanel2.add(s6); jPanel2.add(b2); jPanel2.add(s7); jPanel2.add(s8); jPanel2.add(s9); jPanel2.add(b3); jPanel2.add(s0); jPanel2.add(f1); jPanel2.add(f2); jPanel2.add(b4); con.add(jPanel2,BorderLayout.CENTER); } public void num(int i){ String s = null; s=String.valueOf(i); if(end){ //如果数字输入结束，则将文本框置零，重新输入 resultField.setText("0"); end=false; } if((resultField.getText()).equals("0")){ //如果文本框的内容为零，则覆盖文本框的内容 resultField.setText(s); } else{ //如果文本框的内容不为零，则在内容后面添加数字 str = resultField.getText() + s; resultField.setText(str); } } public void actionPerformed(ActionEvent e){ //数字事件 if(e.getSource()==s1) num(1); else if(e.getSource()==s2) num(2); else if(e.getSource()==s3) num(3); else if(e.getSource()==s4) num(4); else if(e.getSource()==s5) num(5); else if(e.getSource()==s6) num(6); else if(e.getSource()==s7) num(7); else if(e.getSource()==s8) num(8); else if(e.getSource()==s9) num(9); else if(e.getSource()==s0) num(0); //符号事件 else if(e.getSource()==b1) sign(1); else if(e.getSource()==b2) sign(2); else if(e.getSource()==b3) sign(3); else if(e.getSource()==b4) sign(4); //等号 else if(e.getSource()==f1){ str=resultField.getText(); if(str.indexOf(".")<=1){ str+="."; resultField.setText(str); } } else if(e.getSource()==f2){ num2=Double.parseDouble(resultField.getText()); if(add){ num1=num1 + num2;} else if(sub){ num1=num1 - num2;} else if(mul){ num1=num1 * num2;} else if(div){ num1=num1 / num2;} resultField.setText(String.valueOf(num1)); end=true; } } public void sign(int s){ if(s==1){ add=true; sub=false; mul=false; div=false; } else if(s==2){ add=false; sub=true; mul=false; div=false; } else if(s==3){ add=false; sub=false; mul=true; div=false; } else if(s==4){ add=false; sub=false; mul=false; div=true; } num1=Double.parseDouble(resultField.getText()); end=true; } public static void main(String[] args){ testZ th1=new testZ(); th1.show(); } } 应该好看了撒 自己看看有什么问题找我

求一个JAVA计算器源代码。不要按钮的那种。速度。。急用

import java.awt.*; import java.awt.event.*; import java.lang.*; import javax.swing.*; public class Counter extends Frame { //声明三个面板的布局 GridLayout gl1,gl2,gl3; Panel p0,p1,p2,p3; JTextField tf1; TextField tf2; Button b0,b1,b2,b3,b4,b5,b6,b7,b8,b9,b10,b11,b12,b13,b14,b15,b16,b17,b18,b19,b20,b21,b22,b23,b24,b25,b26; StringBuffer str;//显示屏所显示的字符串 double x,y;//x和y都是运算数 int z;//Z表示单击了那一个运算符.0表示"+",1表示"-",2表示"*",3表示"/" static double m;//记忆的数字 public Counter() { gl1=new GridLayout(1,4,10,0);//实例化三个面板的布局 gl2=new GridLayout(4,1,0,15); gl3=new GridLayout(4,5,10,15); tf1=new JTextField(27);//显示屏 tf1.setHorizontalAlignment(JTextField.RIGHT); tf1.setEnabled(false); tf1.setText("0"); tf2=new TextField(10);//显示记忆的索引值 tf2.setEditable(false); //实例化所有按钮、设置其前景色并注册监听器 b0=new Button("Backspace"); b0.setForeground(Color.red); b0.addActionListener(new Bt()); b1=new Button("CE"); b1.setForeground(Color.red); b1.addActionListener(new Bt()); b2=new Button("C"); b2.setForeground(Color.red); b2.addActionListener(new Bt()); b3=new Button("MC"); b3.setForeground(Color.red); b3.addActionListener(new Bt()); b4=new Button("MR"); b4.setForeground(Color.red); b4.addActionListener(new Bt()); b5=new Button("MS"); b5.setForeground(Color.red); b5.addActionListener(new Bt()); b6=new Button("M+"); b6.setForeground(Color.red); b6.addActionListener(new Bt()); b7=new Button("7"); b7.setForeground(Color.blue); b7.addActionListener(new Bt()); b8=new Button("8"); b8.setForeground(Color.blue); b8.addActionListener(new Bt()); b9=new Button("9"); b9.setForeground(Color.blue); b9.addActionListener(new Bt()); b10=new Button("/"); b10.setForeground(Color.red); b10.addActionListener(new Bt()); b11=new Button("sqrt"); b11.setForeground(Color.blue); b11.addActionListener(new Bt()); b12=new Button("4"); b12.setForeground(Color.blue); b12.addActionListener(new Bt()); b13=new Button("5"); b13.setForeground(Color.blue); b13.addActionListener(new Bt()); b14=new Button("6"); b14.setForeground(Color.blue); b14.addActionListener(new Bt()); b15=new Button("*"); b15.setForeground(Color.red); b15.addActionListener(new Bt()); b16=new Button("%"); b16.setForeground(Color.blue); b16.addActionListener(new Bt()); b17=new Button("1"); b17.setForeground(Color.blue); b17.addActionListener(new Bt()); b18=new Button("2"); b18.setForeground(Color.blue); b18.addActionListener(new Bt()); b19=new Button("3"); b19.setForeground(Color.blue); b19.addActionListener(new Bt()); b20=new Button("-"); b20.setForeground(Color.red); b20.addActionListener(new Bt()); b21=new Button("1/X"); b21.setForeground(Color.blue); b21.addActionListener(new Bt()); b22=new Button("0"); b22.setForeground(Color.blue); b22.addActionListener(new Bt()); b23=new Button("+/-"); b23.setForeground(Color.blue); b23.addActionListener(new Bt()); b24=new Button("."); b24.setForeground(Color.blue); b24.addActionListener(new Bt()); b25=new Button("+"); b25.setForeground(Color.red); b25.addActionListener(new Bt()); b26=new Button("="); b26.setForeground(Color.red); b26.addActionListener(new Bt()); //实例化四个面板 p0=new Panel(); p1=new Panel(); p2=new Panel(); p3=new Panel(); //创建一个空字符串缓冲区 str=new StringBuffer(); //添加面板p0中的组件和设置其在框架中的位置和大小 p0.add(tf1); p0.setBounds(10,25,300,40); //添加面板p1中的组件和设置其在框架中的位置和大小 p1.setLayout(gl1); p1.add(tf2); p1.add(b0); p1.add(b1); p1.add(b2); p1.setBounds(10,65,300,25); //添加面板p2中的组件并设置其的框架中的位置和大小 p2.setLayout(gl2); p2.add(b3); p2.add(b4); p2.add(b5); p2.add(b6); p2.setBounds(10,110,40,150); //添加面板p3中的组件并设置其在框架中的位置和大小 p3.setLayout(gl3);//设置p3的布局 p3.add(b7); p3.add(b8); p3.add(b9); p3.add(b10); p3.add(b11); p3.add(b12); p3.add(b13); p3.add(b14); p3.add(b15); p3.add(b16); p3.add(b17); p3.add(b18); p3.add(b19); p3.add(b20); p3.add(b21); p3.add(b22); p3.add(b23); p3.add(b24); p3.add(b25); p3.add(b26); p3.setBounds(60,110,250,150); //设置框架中的布局为空布局并添加4个面板 setLayout(null); add(p0); add(p1); add(p2); add(p3); setResizable(false);//禁止调整框架的大小 //匿名类关闭窗口 addWindowListener(new WindowAdapter(){ public void windowClosing(WindowEvent e1) { System.exit(0); } }); setBackground(Color.lightGray); setBounds(100,100,320,280); setVisible(true); } //构造监听器 class Bt implements ActionListener { public void actionPerformed(ActionEvent e2) { try{ if(e2.getSource()==b1)//选择"CE"清零 { tf1.setText("0");//把显示屏清零 str.setLength(0);//清空字符串缓冲区以准备接收新的输入运算数 } else if(e2.getSource()==b2)//选择"C"清零 { tf1.setText("0");//把显示屏清零 str.setLength(0); } else if(e2.getSource()==b23)//单击"+/-"选择输入的运算数是正数还是负数 { x=Double.parseDouble(tf1.getText().trim()); tf1.setText(""+(-x)); } else if(e2.getSource()==b25)//单击加号按钮获得x的值和z的值并清空y的值 { x=Double.parseDouble(tf1.getText().trim()); str.setLength(0);//清空缓冲区以便接收新的另一个运算数 y=0d; z=0; } else if(e2.getSource()==b20)//单击减号按钮获得x的值和z的值并清空y的值 { x=Double.parseDouble(tf1.getText().trim()); str.setLength(0); y=0d; z=1; } else if(e2.getSource()==b15)//单击乘号按钮获得x的值和z的值并清空y的值 { x=Double.parseDouble(tf1.getText().trim()); str.setLength(0); y=0d; z=2; } else if(e2.getSource()==b10)//单击除号按钮获得x的值和z的值并空y的值 { x=Double.parseDouble(tf1.getText().trim()); str.setLength(0); y=0d; z=3; } else if(e2.getSource()==b26)//单击等号按钮输出计算结果 { str.setLength(0); switch(z) { case 0 : tf1.setText(""+(x+y));break; case 1 : tf1.setText(""+(x-y));break; case 2 : tf1.setText(""+(x*y));break; case 3 : tf1.setText(""+(x/y));break; } } else if(e2.getSource()==b24)//单击"."按钮输入小数 { if(tf1.getText().trim().indexOf(′.′)!=-1)//判断字符串中是否已经包含了小数点 { } else//如果没数点有小 { if(tf1.getText().trim().equals("0"))//如果初时显示为0 { str.setLength(0); tf1.setText((str.append("0"+e2.getActionCommand())).toString()); } else if(tf1.getText().trim().equals(""))//如果初时显示为空则不做任何操作 { } else { tf1.setText(str.append(e2.getActionCommand()).toString()); } } y=0d; } else if(e2.getSource()==b11)//求平方根 { x=Double.parseDouble(tf1.getText().trim()); tf1.setText("数字格式异常"); if(x<0) tf1.setText("负数没有平方根"); else tf1.setText(""+Math.sqrt(x)); str.setLength(0); y=0d; } else if(e2.getSource()==b16)//单击了"%"按钮 { x=Double.parseDouble(tf1.getText().trim()); tf1.setText(""+(0.01*x)); str.setLength(0); y=0d; } else if(e2.getSource()==b21)//单击了"1/X"按钮 { x=Double.parseDouble(tf1.getText().trim()); if(x==0) { tf1.setText("除数不能为零"); } else { tf1.setText(""+(1/x)); } str.setLength(0); y=0d; } else if(e2.getSource()==b3)//MC为清除内存 { m=0d; tf2.setText(""); str.setLength(0); } else if(e2.getSource()==b4)//MR为重新调用存储的数据 { if(tf2.getText().trim()!="")//有记忆数字 { tf1.setText(""+m); } } else if(e2.getSource()==b5)//MS为存储显示的数据 { m=Double.parseDouble(tf1.getText().trim()); tf2.setText("M"); tf1.setText("0"); str.setLength(0); } else if(e2.getSource()==b6)//M+为将显示的数字与已经存储的数据相加要查看新的数字单击MR { m=m+Double.parseDouble(tf1.getText().trim()); } else//选择的是其他的按钮 { if(e2.getSource()==b22)//如果选择的是"0"这个数字键 { if(tf1.getText().trim().equals("0"))//如果显示屏显示的为零不做操作 { } else { tf1.setText(str.append(e2.getActionCommand()).toString()); y=Double.parseDouble(tf1.getText().trim()); } } else if(e2.getSource()==b0)//选择的是“BackSpace”按钮 { if(!tf1.getText().trim().equals("0"))//如果显示屏显示的不是零 { if(str.length()!=1) { tf1.setText(str.delete(str.length()-1,str.length()).toString());//可能抛出字符串越界异常 } else { tf1.setText("0"); str.setLength(0); } } y=Double.parseDouble(tf1.getText().trim()); } else//其他的数字键 { tf1.setText(str.append(e2.getActionCommand()).toString()); y=Double.parseDouble(tf1.getText().trim()); } } } catch(NumberFormatException e){ tf1.setText("数字格式异常"); } catch(StringIndexOutOfBoundsException e){ tf1.setText("字符串索引越界"); } } } public static void main(String args[]) { new Counter(); } }

求java简单计算器源代码

import java.awt.*; import java.awt.event.*; import javax.swing.*; public class Calculator { public static void main(String[] args) { CalculatorFrame frame=new CalculatorFrame(); frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); frame.setVisible(true); } } class CalculatorFrame extends JFrame { public CalculatorFrame() { setTitle("Calculator"); CalculatorPanel panel=new CalculatorPanel(); add(panel); pack(); } } class CalculatorPanel extends Panel { public CalculatorPanel() { setLayout(new BorderLayout()); result=0; lastCommand="="; start=true; flag=true; display=new JButton("0"); display.setEnabled(false); add(display,BorderLayout.NORTH); ActionListener insert=new InsertAction(); mand=new CommandAction(); panel=new JPanel(); panel.setLayout(new GridLayout(4,5)); addButton("7",insert); addButton("8",insert); addButton("9",insert); addButton("/"mand); addButton("CE"mand); addButton("4",insert); addButton("5",insert); addButton("6",insert); addButton("*"mand); addButton("Backspace"mand); addButton("1",insert); addButton("2",insert); addButton("3",insert); addButton("-"mand); addButton("sqrt"mand); addButton("0",insert); addButton(".",insert); addButton("="mand); addButton("+"mand); addButton("1/x"mand); add(panel,BorderLayout.CENTER); } private void addButton(String label,ActionListener listener) { JButton button=new JButton(label); button.addActionListener(listener); panel.add(button); } private class InsertAction implements ActionListener { public void actionPerformed(ActionEvent event) { String input=event.getActionCommand(); if(start&&flag) { display.setText(""); start=false; } if(flag) display.setText(display.getText()+input); } } private class CommandAction implements ActionListener { public void actionPerformed(ActionEvent event) { mand=event.getActionCommand(); mand.equals("CE")) { display.setText("0"); start=true; flag=true; mand="="; } else if(start&&flag) { mand.equals("-")) { mand); start=false; } else if(mand.equals("1/x")|mand.equals("sqrt"))&&flag) calculate(Double.parseDouble(display.getText())mand); else if(flag) mand; } else { mand.equals("Backspace")&&flag) { String s=display.getText(); char[] s1=s.toCharArray(); if(s.length()>=2) { String s2=new String(s1,0,s.length()-1); display.setText(s2); } else { display.setText("0"); start=true; } } else if(flag) { calculate(Double.parseDouble(display.getText())mand); mand; start=true; } } } } public void calculate(double x,mand) { if(lastCommand.equals("+")) result+=x; else if(lastCommand.equals("-")) result-=x; else if(lastCommand.equals("/")) { if(x!=0) result/=x; else { display.setText("除数不能为0"); start=false; flag=false; return; } } else if(lastCommand.equals("*")) result*=x; else mand.equals("1/x")) { if(x!=0) result=1/x; else { display.setText("除数不能为0"); start=false; flag=false; return; } } else mand.equals("sqrt")) { if(x>=0) result=Math.sqrt(x); else { display.setText("函数输入无效"); start=false; flag=false; return; } } else if(lastCommand.equals("=")) result=x; display.setText(""+result); } private JButton display; private JPanel panel; private double result; private String lastCommand; private boolean start; private boolean flag; }

求java简单计算器源代码

import java.awt.*; import java.awt.event.*; import javax.swing.*; public class Calculator { public static void main(String[] args) { CalculatorFrame frame=new CalculatorFrame(); frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); frame.setVisible(true); } } class CalculatorFrame extends JFrame { public CalculatorFrame() { setTitle("Calculator"); CalculatorPanel panel=new CalculatorPanel(); add(panel); pack(); } } class CalculatorPanel extends Panel { public CalculatorPanel() { setLayout(new BorderLayout()); result=0; lastCommand="="; start=true; flag=true; display=new JButton("0"); display.setEnabled(false); add(display,BorderLayout.NORTH); ActionListener insert=new InsertAction(); mand=new CommandAction(); panel=new JPanel(); panel.setLayout(new GridLayout(4,5)); addButton("7",insert); addButton("8",insert); addButton("9",insert); addButton("/"mand); addButton("CE"mand); addButton("4",insert); addButton("5",insert); addButton("6",insert); addButton("*"mand); addButton("Backspace"mand); addButton("1",insert); addButton("2",insert); addButton("3",insert); addButton("-"mand); addButton("sqrt"mand); addButton("0",insert); addButton(".",insert); addButton("="mand); addButton("+"mand); addButton("1/x"mand); add(panel,BorderLayout.CENTER); } private void addButton(String label,ActionListener listener) { JButton button=new JButton(label); button.addActionListener(listener); panel.add(button); } private class InsertAction implements ActionListener { public void actionPerformed(ActionEvent event) { String input=event.getActionCommand(); if(start&&flag) { display.setText(""); start=false; } if(flag) display.setText(display.getText()+input); } } private class CommandAction implements ActionListener { public void actionPerformed(ActionEvent event) { mand=event.getActionCommand(); mand.equals("CE")) { display.setText("0"); start=true; flag=true; mand="="; } else if(start&&flag) { mand.equals("-")) { mand); start=false; } else if(mand.equals("1/x")|mand.equals("sqrt"))&&flag) calculate(Double.parseDouble(display.getText())mand); else if(flag) mand; } else { mand.equals("Backspace")&&flag) { String s=display.getText(); char[] s1=s.toCharArray(); if(s.length()>=2) { String s2=new String(s1,0,s.length()-1); display.setText(s2); } else { display.setText("0"); start=true; } } else if(flag) { calculate(Double.parseDouble(display.getText())mand); mand; start=true; } } } } public void calculate(double x,mand) { if(lastCommand.equals("+")) result+=x; else if(lastCommand.equals("-")) result-=x; else if(lastCommand.equals("/")) { if(x!=0) result/=x; else { display.setText("除数不能为0"); start=false; flag=false; return; } } else if(lastCommand.equals("*")) result*=x; else mand.equals("1/x")) { if(x!=0) result=1/x; else { display.setText("除数不能为0"); start=false; flag=false; return; } } else mand.equals("sqrt")) { if(x>=0) result=Math.sqrt(x); else { display.setText("函数输入无效"); start=false; flag=false; return; } } else if(lastCommand.equals("=")) result=x; display.setText(""+result); } private JButton display; private JPanel panel; private double result; private String lastCommand; private boolean start; private boolean flag; }

用java代码编写个计算器代码:

public class Calculator { void he(float num1,float num2) { System.out.println(num1+"+"+num2+"="+(num1+num2)); } void cha(float num1,float num2) { System.out.println(num1+"-"+num2+"="+(num1-num2)); } void ji(float num1,float num2) { System.out.println(num1+"×"+num2+"="+(num1*num2)); } void shang(float num1,float num2) { System.out.println(num1+"÷"+num2+"="+(num1/num2)); } public static void main(String[] args) { Calculator test=new Calculator(); test.he(3.111f,3f); test.cha(3.111f,3f); test.ji(3.111f,3f); test.shang(3.111f,3f); } }