「java简单计算机程序」计算机语言Java
本篇文章给大家谈谈java简单计算机程序，以及计算机语言Java对应的知识点，希望对各位有所帮助，不要忘了收藏本站喔。
本文目录一览：
- 1、用Java编写一个简单的计算器程序
- 2、用JAVA编写一个简单的计算器，要求如下:
- 3、求一个用JAVA编写的计算器程序（1）实现简单加、减、乘、除的运算。 （
- 4、用Java写一个计算机的程序怎么写啊拜托了各位 谢谢
用Java编写一个简单的计算器程序
import java.awt.*;
import java.awt.event.*;
public class CalcAppDemo extends Frame{
private TextField t_result;
private Panel p_main; //主面板
private Panel p_num; //数字面板
private Panel p_oper; //操作符面板
private Panel p_show; //显示面板
private Button b_num[]; //数字按钮
private Button b_oper[]; //操作符面板
public CalcAppDemo(String title){
setTitle(title);
t_result = new TextField("0.0", 21);
p_main = new Panel();
p_num = new Panel();
p_oper = new Panel();
p_show = new Panel();
p_main.setLayout(new BorderLayout());
p_num.setLayout(new GridLayout(4, 3, 1, 1));
p_oper.setLayout(new GridLayout(4, 2, 1, 1));
b_num = new Button[12];
for(int i=0; i9; i++)
{
b_num[i] = new Button(new Integer(i+1).toString());
}
b_num[9] = new Button("0");
b_num[10] = new Button("cls");
b_num[11] = new Button(".");
for(int i=0; i12; i++)
{
p_num.add(b_num[i]);
}
b_oper = new Button[8];
b_oper[0] = new Button("+");
b_oper[1] = new Button("-");
b_oper[2] = new Button("*");
b_oper[3] = new Button("/");
b_oper[4] = new Button("pow");
b_oper[5] = new Button("sqrt");
b_oper[6] = new Button("+/-");
b_oper[7] = new Button("=");
for(int i=0; i8; i++) //
{
p_oper.add(b_oper[i]);
}
t_result.setEditable(false);
p_show.add(t_result, BorderLayout.NORTH);
p_main.add(p_show, BorderLayout.NORTH);
p_main.add(p_num, BorderLayout.WEST);
p_main.add(p_oper, BorderLayout.EAST);
this.add(p_main, BorderLayout.CENTER);
setSize(400, 400);
setResizable(false);
pack();
this.addWindowListener(new WindowAdapter(){
public void windowClosing(WindowEvent e)
{
System.exit(0);
}
});
ButtonListener b1 = new ButtonListener();
for(int i=0; i12; i++)
{
b_num[i].addActionListener(b1);
}
for(int i=0; i8; i++)
{
b_oper[i].addActionListener(b1);
}
}
class ButtonListener implements ActionListener
{
private String lastOp; //存储上一此操作符
private String strVal; //存储数字对应的字符串
private double total; //总数
private double number; //存储新输入的数
private boolean firsttime; //判断是否第一次按下的是操作符按钮
private boolean operatorPressed;//判断是否已经按过操作符按钮
ButtonListener()
{
firsttime = true;
strVal = "";
}
//事件处理器
public void actionPerformed(ActionEvent e)
{
String s = ((Button)e.getSource()).getLabel().trim();
if(Character.isDigit(s.charAt(0)))
{//判断是操作数还是操作符
handleNumber(s);
}
else
{
calculate(s);
}
}
//判断是一元操作符还是二元操作符，并根据操作符类型做计算
void calculate(String op)
{
operatorPressed = true;
if(firsttime! isUnary(op))
{
total = getNumberOnDisplay();
firsttime = false;
}
if(isUnary(op))
{
handleUnaryOp(op);
}
else if(lastOp != null)
{
handleBinaryOp(lastOp);
}
if(! isUnary(op))
{
lastOp = op;
}
}
//判断是否一元操作符
boolean isUnary(String s)
{
return s.equals("=")
||s.equals("cls")||s.equals("sqrt")
||s.equals("+/-")||s.equals(".");
}
//处理一元操作符
void handleUnaryOp(String op)
{
if(op.equals("+/-"))
{//
number = negate(getNumberOnDisplay() + "");
t_result.setText("");
t_result.setText(number + "");
return;
}else if(op.equals("."))
{
handleDecPoint();
return;
}else if(op.equals("sqrt"))
{
number = Math.sqrt(getNumberOnDisplay());
t_result.setText("");
t_result.setText(number + "");
return;
}else if(op.equals("="))
{//
if(lastOp!= null !isUnary(lastOp))
{
handleBinaryOp(lastOp);
}
lastOp = null;
firsttime = true;
return;
}else
{
clear();
}
}
//处理二元运算符
void handleBinaryOp(String op)
{
if(op.equals("+"))
{
total +=number;
}else if(op.equals("-"))
{
total -=number;
}else if(op.equals("*"))
{
total *=number;
}else if(op.equals("/"))
{
try
{
total /=number;
}catch(ArithmeticException ae){}
}else if(op.equals("pow"))
total = Math.pow(total, number);
//t_result.setText("");
lastOp = null;
// strVal = "";
number = 0;
t_result.setText(total + "");
}
//该方法用于处理数字按钮
void handleNumber(String s)
{
if(!operatorPressed)
{
strVal += s;
}else
{
operatorPressed = false;
strVal = s;
}
//
number = new Double(strVal).doubleValue();
t_result.setText("");
t_result.setText(strVal);
}
//该方法用于按下"."按钮
void handleDecPoint()
{
operatorPressed = false;
//
if(strVal.indexOf(".")0)
{
strVal += ".";
}
t_result.setText("");
t_result.setText(strVal);
}
//该方法用于将一个数求反
double negate(String s)
{
operatorPressed = false;
//如果是一个整数，去掉小数点后面的0
if(number == (int)number)
{
s = s.substring(0,s.indexOf("."));
}
//如果无"-"增加在该数的前面
if(s.indexOf("-")0)
{
strVal = "-" + s;
}
else
{
strVal = s.substring(1);
}
return new Double(strVal).doubleValue();
}
//将显示框中的值转换成Double
double getNumberOnDisplay()
{
return new Double(t_result.getText()).doubleValue();
}
//清除屏幕并设置所有的标识
void clear()
{
firsttime = true;
lastOp = null;
strVal = "";
total = 0;
number = 0;
t_result.setText("0");
}
}
public static void main(String[] args) {
CalcAppDemo c = new CalcAppDemo("简单的计算器程序");
c.setVisible(true);
}
}
用JAVA编写一个简单的计算器，要求如下:
然后 通过输入 显示结果，比如说：
以下是上图计算器的代码:
package Computer;
import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.Container;
import java.awt.Font;
import java.awt.GridLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.util.Stack;
import javax.swing.JApplet;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.JTextField;
public class Count extends JApplet implements ActionListener
{
/**
*
*/
private static final long serialVersionUID = 1L;
private JTextField textField = new JTextField("请输入");
String operator = "";//操作
String input = "";//输入的 式子
boolean flag = true;
// boolean flag1 = true;
// boolean flag2 = true;
public void init()//覆写Applet里边的init方法
{
Container C = getContentPane();
JButton b[] = new JButton[16];
JPanel panel = new JPanel();
C.add(textField, BorderLayout.NORTH);
C.add(panel,BorderLayout.CENTER);
panel.setLayout(new GridLayout(4, 4,5,5));
String name[]={"7","8","9","+","4","5","6","-","1","2","3","*","0","C","=","/"};//设置 按钮
for(int i=0;i16;i++)//添加按钮
{
b[i] = new JButton(name[i]);
b[i].setBackground(new Color(192,192,192));
b[i].setForeground(Color.BLUE);//数字键 设置为 蓝颜色
if(i%4==3)
b[i].setForeground(Color.RED);
b[i].setFont(new Font("宋体",Font.PLAIN,16));//设置字体格式
panel.add(b[i]);
b[i].addActionListener(this);
}
b[13].setForeground(Color.RED);//非数字键，即运算键设置为红颜色
b[13].setForeground(Color.RED);
}
public void actionPerformed(ActionEvent e)
{
int cnt = 0;
String actionCommand = e.getActionCommand();
if(actionCommand.equals("+")||actionCommand.equals("-")||actionCommand.equals("*") ||actionCommand.equals("/"))
input +=" "+actionCommand+" ";//设置输入，把输入的样式改成 需要的样子
else if(actionCommand.equals("C"))
input = "";
else if(actionCommand.equals("="))//当监听到等号时，则处理 input
{
input+= "="+compute(input);
textField.setText(input);
input="";
cnt = 1;
}
else
input += actionCommand;//数字为了避免多位数的输入 不需要加空格
if(cnt==0)
textField.setText(input);
}
private String compute(String input)//即1237 的 样例
{
String str[];
str = input.split(" ");
StackDouble s = new StackDouble();
double m = Double.parseDouble(str[0]);
s.push(m);
for(int i=1;istr.length;i++)
{
if(i%2==1)
{
if(str[i].compareTo("+")==0)
{
double help = Double.parseDouble(str[i+1]);
s.push(help);
}
if(str[i].compareTo("-")==0)
{
double help = Double.parseDouble(str[i+1]);
s.push(-help);
}
if(str[i].compareTo("*")==0)
{
double help = Double.parseDouble(str[i+1]);
double ans = s.peek();//取出栈顶元素
s.pop();//消栈
ans*=help;
s.push(ans);
}
if(str[i].compareTo("/")==0)
{
double help = Double.parseDouble(str[i+1]);
double ans = s.peek();
s.pop();
ans/=help;
s.push(ans);
}
}
}
double ans = 0d;
while(!s.isEmpty())
{
ans+=s.peek();
s.pop();
}
String result = String.valueOf(ans);
return result;
}
public static void main(String args[])
{
JFrame frame = new JFrame("Count");
Count applet = new Count();
frame.getContentPane().add(applet, BorderLayout.CENTER);
applet.init();//applet的init方法
applet.start();//线程开始
frame.setSize(350, 400);//设置窗口大小
frame.setVisible(true);//设置窗口可见
}
}
求一个用JAVA编写的计算器程序（1）实现简单加、减、乘、除的运算。 （
public
MyCalculator()
{
f
=
new
JFrame("计算器ByMdou");
Container
contentPane
=
f.getContentPane();
/****************菜单的创建开始**************************************/
JMenuBar
mBar
=
new
JMenuBar();
mBar.setOpaque(true);
mEdit
=
new
JMenu("编辑(E)");
mEdit.setMnemonic(KeyEvent.VK_E);
mCopy
=
new
JMenuItem("复制(C)");
mEdit.add(mCopy);
mPaste
=
new
JMenuItem("粘贴(P)");
mEdit.add(mPaste);
mView
=
new
JMenu("查看(V)");
mView.setMnemonic(KeyEvent.VK_V);
mView.add(new
JMenuItem("标准型"));
mView.add(new
JMenuItem("科学型"));
mView.addSeparator();
mView.add(new
JMenuItem("查看分组"));
mHelp
=
new
JMenu("帮助(H)");
mHelp.setMnemonic(KeyEvent.VK_H);
mHelp.add(new
JMenuItem("帮助主题"));
mHelp.addSeparator();
mHelp.add(new
JMenuItem("关于计算器"));
mBar.add(mEdit);
mBar.add(mView);
mBar.add(mHelp);
f.setJMenuBar(mBar);
contentPane.setLayout(new
BorderLayout
());
JPanel
pTop
=
new
JPanel();
tResult
=
new
JTextField("0.",26);
tResult.setHorizontalAlignment(JTextField.RIGHT
);
tResult.setEditable(false);
pTop.add(tResult);
contentPane.add(pTop,BorderLayout.NORTH);
JPanel
pBottom
=
new
JPanel();
pBottom.setLayout(new
BorderLayout());
JPanel
pLeft
=
new
JPanel();
pLeft.setLayout(new
GridLayout(5,1,3,3));
bM
=
new
JButton("
");
bM.setEnabled(false);
pLeft.add(bM);
bOther
=
new
JButton("MC");
bOther.addActionListener(this);
bOther.setForeground(Color.RED);
bOther.setMargin(new
Insets(3,2,3,2));
pLeft.add(bOther);
bOther
=
new
JButton("MR");
bOther.addActionListener(this);
bOther.setForeground(Color.RED);
bOther.setMargin(new
Insets(3,2,3,2));
pLeft.add(bOther);
bOther
=
new
JButton("MS");
bOther.addActionListener(this);
bOther.setForeground(Color.RED);
bOther.setMargin(new
Insets(3,2,3,2));
pLeft.add(bOther);
bOther
=
new
JButton("M+");
bOther.addActionListener(this);
bOther.setForeground(Color.RED);
bOther.setMargin(new
Insets(3,2,3,2));
pLeft.add(bOther);
用Java写一个计算机的程序怎么写啊拜托了各位 谢谢
import java.awt.BorderLayout; import java.awt.Button; import java.awt.Container; import java.awt.GridLayout; import java.awt.event.ActionEvent; import java.awt.event.ActionListener; import java.awt.event.KeyEvent; import java.awt.event.KeyListener; import java.awt.event.WindowAdapter; import java.awt.event.WindowEvent; import javax.swing.JFrame; import javax.swing.JOptionPane; import javax.swing.JPanel; import javax.swing.JTextField; import javax.swing.WindowConstants; public class Caculator extends JFrame implements ActionListener,KeyListener{ private JTextField tf=new JTextField(); private float x=0; private float y=0; private int code=0; private boolean enable; private boolean first; private String str=""; public Caculator(){ Container ct=this.getContentPane(); this.setDefaultCloseOperation(WindowConstants.DO_NOTHING_ON_CLOSE); tf.setHorizontalAlignment(JTextField.RIGHT); //tf.setText("0"); enable=true; first=true; ct.add(tf,BorderLayout.NORTH); JPanel panel=new JPanel(); panel.setLayout(new GridLayout(4,4)); this.addWindowListener(new WindowAdapter(){ public void windowClosing(WindowEvent e){ if(JOptionPane.YES_OPTION==JOptionPane.showConfirmDialog(Caculator.this,"确定要关闭程序吗?","提示",JOptionPane.OK_CANCEL_OPTION,JOptionPane.QUESTION_MESSAGE)){ e.getWindow().setVisible(false); e.getWindow().dispose(); System.exit(0); } } }); Button btn=null; btn=new Button("1"); panel.add(btn); btn.addActionListener(this); btn.addKeyListener(this); btn=new Button("2"); panel.add(btn); btn.addActionListener(this); btn.addKeyListener(this); btn=new Button("3"); panel.add(btn); btn.addActionListener(this); btn.addKeyListener(this); btn=new Button("+"); panel.add(btn); btn.addActionListener(this); btn.addKeyListener(this); btn=new Button("4"); panel.add(btn); btn.addActionListener(this); btn.addKeyListener(this); btn=new Button("5"); panel.add(btn); btn.addActionListener(this); btn.addKeyListener(this); btn=new Button("6"); panel.add(btn); btn.addActionListener(this); btn.addKeyListener(this); btn=new Button("-"); panel.add(btn); btn.addActionListener(this); btn.addKeyListener(this); btn=new Button("7"); panel.add(btn); btn.addActionListener(this); btn.addKeyListener(this); btn=new Button("8"); panel.add(btn); btn.addActionListener(this); btn.addKeyListener(this); btn=new Button("9"); panel.add(btn); btn.addActionListener(this); btn.addKeyListener(this); btn=new Button("*"); panel.add(btn); btn.addActionListener(this); btn.addKeyListener(this); btn=new Button("0"); panel.add(btn); btn.addActionListener(this); btn.addKeyListener(this); btn=new Button("."); panel.add(btn); btn.addActionListener(this); btn.addKeyListener(this); btn=new Button("/"); panel.add(btn); btn.addActionListener(this); btn.addKeyListener(this); btn=new Button("="); panel.add(btn); btn.addActionListener(this); btn.addKeyListener(this); this.add(panel,BorderLayout.CENTER); } /** * @param args */ public static void main(String[] args) { // TODO Auto-generated method stub Caculator mainframe=new Caculator(); mainframe.setTitle("testing Caculator"); mainframe.setSize(400,400); mainframe.setVisible(true); } public void actionPerformed(ActionEvent e) { // TODO Auto-generated method stub if(e.getActionCommand()=="+"){ x= Float.parseFloat(tf.getText()); code=0; this.tf.setText(""); } if(e.getActionCommand()=="-"){ x= Float.parseFloat(tf.getText()); code=1; this.tf.setText(""); } if(e.getActionCommand()=="*"){ x= Float.parseFloat(tf.getText()); code=2; this.tf.setText(""); } if(e.getActionCommand()=="/"){ x= Float.parseFloat(tf.getText()); code=3; this.tf.setText(""); } if(e.getActionCommand()!="+"e.getActionCommand()!="-"e.getActionCommand()!="*"e.getActionCommand()!="/"e.getActionCommand()!="="){ if(enable){ if(first){ System.out.println("haha"); tf.setText(e.getActionCommand()); first=false; } else { tf.setText(tf.getText()+e.getActionCommand()); } } else { tf.setText(e.getActionCommand()); enable=true; } } if(e.getActionCommand()=="="){ switch(code){ case 0: y=x+Float.parseFloat(this.tf.getText()); tf.setText(Float.toString(y)); enable=false; break; case 1: y=x-Float.parseFloat(this.tf.getText()); tf.setText(Float.toString(y)); enable=false; break; case 2: y=x*Float.parseFloat(this.tf.getText()); tf.setText(Float.toString(y)); enable=false; break; case 3: y=x/Float.parseFloat(this.tf.getText()); tf.setText(Float.toString(y)); enable=false; break; } } } public void keyPressed(KeyEvent e) { // TODO Auto-generated method stub if(e.getKeyChar()=='+'){ x= Float.parseFloat(tf.getText()); code=0; this.tf.setText(""); } if(e.getKeyChar()=='-'){ x= Float.parseFloat(tf.getText()); code=1; this.tf.setText(""); } if(e.getKeyChar()=='*'){ x= Float.parseFloat(tf.getText()); code=2; this.tf.setText(""); } if(e.getKeyChar()=='/'){ x= Float.parseFloat(tf.getText()); code=3; this.tf.setText(""); } if(e.getKeyChar()=='1'||e.getKeyChar()=='2'||e.getKeyChar()=='3'||e.getKeyChar()=='0' ||e.getKeyChar()=='4'||e.getKeyChar()=='5'||e.getKeyChar()=='6'||e.getKeyChar()=='.' ||e.getKeyChar()=='7'||e.getKeyChar()=='8'||e.getKeyChar()=='9'){ System.out.println("hai"); if(enable){ if(first){ System.out.println("hehe"); str=Character.toString(e.getKeyChar()); tf.setText(str); first=false; } else { str=Character.toString(e.getKeyChar()); tf.setText(tf.getText()+str); } } else { str=Character.toString(e.getKeyChar()); tf.setText(str); enable=true; } } if(e.getKeyCode()==KeyEvent.VK_ENTER){ switch(code){ case 0: y=x+Float.parseFloat(this.tf.getText()); tf.setText(Float.toString(y)); enable=false; break; case 1: y=x-Float.parseFloat(this.tf.getText()); tf.setText(Float.toString(y)); enable=false; break; case 2: y=x*Float.parseFloat(this.tf.getText()); tf.setText(Float.toString(y)); enable=false; break; case 3: y=x/Float.parseFloat(this.tf.getText()); tf.setText(Float.toString(y)); enable=false; break; } } } public void keyReleased(KeyEvent arg0) { // TODO Auto-generated method stub } public void keyTyped(KeyEvent arg0) { // TODO Auto-generated method stub } }
java简单计算机程序的介绍就聊到这里吧，感谢你花时间阅读本站内容，更多关于计算机语言Java、java简单计算机程序的信息别忘了在本站进行查找喔。
发布于：2022-11-27，除非注明，否则均为原创文章，转载请注明出处。