java源代码曲线计算,java画曲线

急！急！求java计算器源代码 最后能出如图这样的界面并能运行 急啊 好的翻倍追加分啊

import java.awt.BorderLayout;

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import java.awt.Button;

import java.awt.FlowLayout;

import java.awt.Frame;

import java.awt.GridLayout;

import java.awt.Panel;

import java.awt.TextField;

import java.awt.event.ActionEvent;

import java.awt.event.ActionListener;

import java.awt.event.WindowAdapter;

import java.awt.event.WindowEvent;

public class CalculatorGUI {

private Frame f;

private Panel p1, p2;

private Button b0, b1, b2, b3, b4, b5, b6, b7, b8, b9;

private Button bPoint, bAdd, bDec, bMul, bDiv, bCal;

private TextField tf;

private String s, op;

private Calculator cal = new Calculator();

private boolean ifOp;

public CalculatorGUI() {

f = new Frame("Calculator");

p1 = new Panel();

p2 = new Panel();

b0 = new Button("0");

b1 = new Button("1");

b2 = new Button("2");

b3 = new Button("3");

b4 = new Button("4");

b5 = new Button("5");

b6 = new Button("6");

b7 = new Button("7");

b8 = new Button("8");

b9 = new Button("9");

bPoint = new Button(".");

bAdd = new Button("+");

bDec = new Button("-");

bMul = new Button("*");

bDiv = new Button("/");

bCal = new Button("=");

tf = new TextField(25);

tf.setEditable(false);

}

public void launchFrame() {

f.setSize(220, 160);

f.setResizable(false);

f.addWindowListener(new myWindowListener());

p1.setLayout(new FlowLayout(FlowLayout.CENTER));

p1.add(tf);

f.add(p1, BorderLayout.NORTH);

p2.setLayout(new GridLayout(4, 4));

b0.addActionListener(new setLabelText_ActionListener());

b1.addActionListener(new setLabelText_ActionListener());

b2.addActionListener(new setLabelText_ActionListener());

b3.addActionListener(new setLabelText_ActionListener());

b4.addActionListener(new setLabelText_ActionListener());

b5.addActionListener(new setLabelText_ActionListener());

b6.addActionListener(new setLabelText_ActionListener());

b7.addActionListener(new setLabelText_ActionListener());

b8.addActionListener(new setLabelText_ActionListener());

b9.addActionListener(new setLabelText_ActionListener());

bPoint.addActionListener(new setLabelText_ActionListener());

bAdd.addActionListener(new setOperator_ActionListener());

bDec.addActionListener(new setOperator_ActionListener());

bMul.addActionListener(new setOperator_ActionListener());

bDiv.addActionListener(new setOperator_ActionListener());

bCal.addActionListener(new setOperator_ActionListener());

p2.add(b7);

p2.add(b8);

p2.add(b9);

p2.add(bAdd);

p2.add(b4);

p2.add(b5);

p2.add(b6);

p2.add(bDec);

p2.add(b1);

p2.add(b2);

p2.add(b3);

p2.add(bMul);

p2.add(b0);

p2.add(bPoint);

p2.add(bCal);

p2.add(bDiv);

f.add(p2, BorderLayout.SOUTH);

f.setVisible(true);

}

public void setTextFieldText_Temp() {

if (tf.getText().length() 15

(tf.getText().indexOf(".") == -1 || !s.equals("."))) {

tf.setText(tf.getText() + s);

} else {

tf.setText((tf.getText() + s).substring(0, 15));

}

}

public void setTextFieldText() {

if (ifOp) {

ifOp = false;

tf.setText("");

setTextFieldText_Temp();

} else {

setTextFieldText_Temp();

}

}

public static void main(String[] args) {

CalculatorGUI calculator = new CalculatorGUI();

calculator.launchFrame();

}

class myWindowListener extends WindowAdapter {

public void windowClosing(WindowEvent e) {

System.exit(0);

}

}

class setLabelText_ActionListener implements ActionListener {

public void actionPerformed(ActionEvent e) {

Button tempB = (Button) e.getSource();

s = tempB.getLabel();

setTextFieldText();

}

}

class setOperator_ActionListener implements ActionListener {

public void actionPerformed(ActionEvent e) {

Button tempB = (Button) e.getSource();

op = tempB.getLabel();

if (op.equals("+")) {

tf.setText(cal.opAdd(tf.getText()));

ifOp = true;

} else if (op.equals("-")) {

tf.setText(cal.opSubtract(tf.getText()));

ifOp = true;

} else if (op.equals("*")) {

tf.setText(cal.opMultiply(tf.getText()));

ifOp = true;

} else if (op.equals("/")) {

tf.setText(cal.opDivide(tf.getText()));

ifOp = true;

} else if (op.equals("=")) {

tf.setText(cal.opEquals(tf.getText()));

ifOp = true;

}

}

}

}

class Calculator {

private String result = "0";

private int op = 0, add = 1, sub = 2, mul = 3, div = 4;

private double stringToDouble(String x) {

double y = Double.parseDouble(x);

return y;

}

private void operate(String x) {

double x1 = stringToDouble(x);

double y = stringToDouble(result);

switch (op) {

case 0:

result = x;

break;

case 1:

result = String.valueOf(y + x1);

break;

case 2:

result = String.valueOf(y - x1);

break;

case 3:

result = String.valueOf(y * x1);

break;

case 4:

if (x1 != 0) {

result = String.valueOf(y / x1);

} else {

result = "The divisor can't be zero!";

}

break;

}

}

public String opAdd(String x) {

operate(x);

op = add;

return result;

}

public String opSubtract(String x) {

operate(x);

op = sub;

return result;

}

public String opMultiply(String x) {

operate(x);

op = mul;

return result;

}

public String opDivide(String x) {

operate(x);

op = div;

return result;

}

public String opEquals(String x) {

operate(x);

op = 0;

return result;

}

public void opClean() {

op = 0;

result = "0";

}

}

Java计算器源代码

import java.awt.*;

import java.awt.event.ActionEvent;

import java.awt.event.ActionListener;

import javax.swing.*;public class CaculatorA {

private JFrame jf;

private JButton[] jbs;

private JTextField jtf;

private JButton clear;

private double num1,num2,jieguo;

private char c;

/**

* 构造方法实例化属性

*

*/

public CaculatorA(){

jf=new JFrame("我的计算器v1.0");

jtf=new JTextField(20);

clear=new JButton("clear");

jbs=new JButton[16];

String str="123+456-789*0./=";

for(int i=0; istr.length(); i++){

jbs[i]=new JButton(str.charAt(i)+"");

}

init();

addEventHandler();

// setFont();

// setColor();

showMe();

}

/**

用java语言如何编写计算圆周长和圆面积程序

可以通过创建一个圆的类完成计算圆周长和面积的功能。

假设这个圆的类名叫做Circle，因为根据圆的半径就可以求出圆的周长和面积，所以可以在这个类中定义一个半径属性mRadius，然后定义两个方法getLength和getArea分别实现计算圆周长和面积的功能。

java语言源代码如下：

public class Circle{

//圆的半径

private double mRadius;

public Circle(double mRadius){

this.mRadius = mRadius;

}

//获取圆的周长

public double getLength(){

return 2*Math.PI*mRadius;

}

//获取圆的面积

public double getArea(){

return Math.PI*mRadius*mRadius;

}

}

//注：由于测试类只是调用Circle类的方法，功能很简单，便没有写测试类。

求一个 JAVA 的 科学计算器 的 源代码最好里面有 sin cos 倒数、平方根、平方、立方高级一点的!

import javax.swing.*;

import java.awt.*;

import java.awt.event.*;

public class Calculator implements ActionListener

{

String s="",s1;

double d1,d2;

JFrame jf = new JFrame("小计算器by Graduate") ;

JTextField tf = new JTextField();

public void init()//实现计算器界面

{

Container c=jf.getContentPane();

tf.setHorizontalAlignment(JTextField.RIGHT);//文本框

c.add(tf,"North");

JPanel pn3 = new JPanel(new BorderLayout());

c.add(pn3,"Center");

JPanel pn2 = new JPanel();//功能键界面（清除键和关闭键）

pn2.setLayout(new BorderLayout());

JPanel pn1 = new JPanel();//运算界面

pn1.setLayout(new GridLayout(4,4));

pn3.add(pn2,"North");

pn3.add(pn1);

//设置按钮

JButton b = new JButton("CLEAR");

b.setToolTipText("请按清除键!");//设置清零键

b.setForeground(Color.RED);//设置字体颜色

b.setBackground(Color.YELLOW);//设置背景色

b.addActionListener(this);

pn2.add(b,"Center");

b = new JButton("OFF");

b.setToolTipText("请按退出键!");//设置off键，点击退出应用程序b.addActionListener(this);

b.setForeground(Color.RED);//字体颜色

b.setBackground(Color.ORANGE);//背景色

pn2.add(b,"East");

b = new JButton("1");//add butten 1

b.addActionListener(this);

pn1.add(b);

b = new JButton("2");//add butten 2

b.addActionListener(this);

pn1.add(b);

b = new JButton("3");//add butten 3

b.addActionListener(this);

pn1.add(b);

b = new JButton("+");//add butten +

b.setForeground(Color.BLUE);//设置字体颜色

b.addActionListener(this);

pn1.add(b);

b = new JButton("4");//add butten 4

b.addActionListener(this);

pn1.add(b);

b = new JButton("5");//add butten 5

b.addActionListener(this);

pn1.add(b);

b = new JButton("6");//add button 6

b.addActionListener(this);

pn1.add(b);

b = new JButton("-");//add button -

b.setForeground(Color.BLUE);//设置字体颜色

b.addActionListener(this);

pn1.add(b);

b = new JButton("7");//add button 7

b.addActionListener(this);

pn1.add(b);

b = new JButton("8");//add button 8

b.addActionListener(this);

pn1.add(b);

b = new JButton("9");//add button 9

b.addActionListener(this);

pn1.add(b);

b = new JButton("*");//add button *

b.setForeground(Color.BLUE);//设置字体颜色

b.addActionListener(this);

pn1.add(b);

b = new JButton("0");//add button 0

b.addActionListener(this);

pn1.add(b);

b = new JButton(".");//add button .

b.addActionListener(this);

pn1.add(b);

b = new JButton("=");//add button =

b.setForeground(Color.RED);//设置字体颜色

b.addActionListener(this);

pn1.add(b);

b = new JButton("\\");//add button \

b.setForeground(Color.BLUE);//设置字体颜色

b.addActionListener(this);

pn1.add(b);

jf.setSize(300,300);//设置大小

jf.setVisible(true);//设置为可视

}

//处理按钮按下时的动作，进行相应的处理

public void actionPerformed(ActionEvent e)

{

String command = e.getActionCommand();

tf.setText(tf.getText()+command);

if(command.equals("CLEAR")) //清零键 按下时返回初始状态

{

s1=null;

s="";

tf.setText("");//记录输入值的变量清空

}

else if(command.equals("OFF")) System.exit(0);//off键 关闭应用程序

else if(!command.equals("*")!command.equals("\\")

!command.equals("+")!command.equals("-")

!command.equals("="))//判断输入是否为数字

{

if(s1==null)//判断输入是否为第一个

s1 = command;

else s1+=command;

d1 = new Double(s1).doubleValue();//字符串型转换为双精度型,还原输入数字

try

{

if(s.equals("+")) d1 = d1+d2;//加法运算

else if(s.equals("-")) d1 = d2-d1;//减法运算

else if(s.equals("*")) d1 = d1*d2;//乘法运算

else if(s.equals("\\"))d1 = d2/d1;//除法运算

}

catch(Exception ex)

{

tf.setText("Error");//错误显示"Error"

System.out.println(ex.getMessage());

}

}

else if(!command.equals("=")) //判断输入是否为+ - * \

{

s = command;

s1 = null;

d2 = d1;

}

else//输入=时,显示运算结果

{

tf.setText(tf.getText()+d1);

}

}

public static void main(String [] args)

{

new Calculator().init();

}

}

已知曲线的公式，如何用JAVA编程将曲线显示出来，要JAVA源代码

代码如下，只是时间仓促有些简陋，没有坐标轴，而且大小比例问题也没有调好。不过功能实现了。嘎嘎，新手上路，腾云驾雾。

import java.awt.Graphics;

import javax.swing.JFrame;

import javax.swing.JPanel;

public class Bbso extends JPanel{

int x,y,x1,y1,m=100;

double d;

public Bbso() {

JFrame f = new JFrame();

f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

f.setBounds(100,100,500,300);

f.setTitle("画曲线");

f.setVisible(true);

f.getContentPane().add(this);

}

public static void main(String arg[]) {

new Bbso();

}

public void paint(Graphics g) {

super.paintComponent(g);

x1=0;

y1=0;

for(x=-250;x250;x++) {

d=-0.2045*x*x+100.41*x-6736.8; //这里填写公式

y=(int)d;

g.drawLine(x1,y1+m,x,y+m);

x1=x;

y1=y;

}

}

}