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编写java源代码图片 java程序源代码
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用java运行以下程序1.7题 求源代码和图片
public class PI {
public static void main(String[] args) {
double PI = 0;
int symbol = 1;
for (int i = 1; i Integer.MAX_VALUE; i += 2) {
PI += symbol * 1.0 / i;
symbol *= -1;
}
PI *= 4;
System.out.println(PI);
}
}
相关问答
Q1: 初学Java，还不会编程，求大神帮下忙写一下程序流程图好源代码
import java.util.Scanner;
public class Test {
public static void main(String[] args) {
Scanner sc = new Scanner(System.in);
int sum = 0;
System.out.println("参数个数：");
int n = sc.nextInt();
for(int i = 0; i n; i++){
System.out.print("输入第[" + (i + 1) + "]个数：" );
String temp = sc.next();
sum += Integer.parseInt(temp);
}
System.out.println("总和为：" + sum);
}
}
Q2: 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;
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";
}
}
Q3: 根据以下的设计要求编写源代码。java
class Student{
private String name;
private int age;
public Student(){
this.name = "nobody";
this.age =20;
}
public void setName(String name){
this.name = name;
}
public String getName(){
return name;
}
public void setAge(int age){
this.age = age;
}
public int getAge(){
return age;
}
public boolean isSameAge(Student s){
return age == s.age;
}
}
Q4: 求java绘图程序源代码（加注释），在如下图的基础上，在图案种类上添加圆角矩形，求代码
直线 是 Line2D
矩形是 Rectangle2D
弧 Arc2D
椭圆 Ellipse2D
圆角矩形是 RoundRectangle2D
上面编写java源代码图片的都在 java.awt.geom包里
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