java程序源代码举例 java程序例子源码

java菜单栏例子的源代码有哪些？

1、第一个Swing程序——JFrame窗体

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需要注意的是 JFrame窗体在初始设置的时候存在几个问题：

1 窗体默认不可见，需要设置成为可见

2 窗体默认没有大小，需要设置其大小

3 窗体默认不能关闭，需要设置关闭方式

2、JFrame中添加面板、布局方式与控件

求JAVA源代码

import java.util.ArrayList;

import java.util.List;

import java.util.Scanner;

public class GradeStatistic {

public static void main(String[] args) {

GradeStatistic gs = new GradeStatistic();

ListMark list = new ArrayListMark();

float sum = 0;

while(true){

Scanner sc = new Scanner(System.in);

System.out.print("Please input student name: ");

String name = sc.nextLine();

if(name.equals("end")){

break;

}

System.out.print("Please input student score: ");

float score = sc.nextFloat();

sum += score;

list.add(gs.new Mark(name, score));

}

float max = list.get(0).getScore();

float min = list.get(0).getScore();

for(Mark mark: list){

if(max mark.getScore()){

max = mark.getScore();

}

if(min mark.getScore()){

min = mark.getScore();

}

}

float average = sum / list.size();

System.out.println("Average is: " + average);

System.out.println("Max is: " + max);

System.out.println("Min is: " + min);

}

private class Mark{

private String name;

private float score;

public Mark(String name, float score){

this.name = name;

this.score = score;

}

public String getName() {

return name;

}

public float getScore() {

return score;

}

}

}

----------------------

Please input student name: Zhang san

Please input student score: 100

Please input student name: Li Si

Please input student score: 91

Please input student name: Ec

Please input student score: 35

Please input student name: ma qi

Please input student score: 67

Please input student name: end

Average is: 73.25

Max is: 100.0

Min is: 35.0

JAVA源程序代码

您好，写了一个程序，求素数，并将所有素数存到ArrayList sushu中：

import java.util.ArrayList;

import java.util.zip.Inflater;

public class sushu {

public static void main(String[] args) {

int n=50,b=0;

float a=0,c=0;

ArrayList sushu=new ArrayList();

for(int i=3;i=n;i++){

int state=0;

for(int j=2;j(i/2+1);j++){

a=(float)i/(float)j;

//System.out.println(a);

b=(int)a;

//System.out.println(a-b);

c=a-b;

//System.out.println(c);

if(c==0){state=1;break;}

}

if(state==0)sushu.add(i);

}

System.out.println(sushu);

}

}

输出结果为：[3, 5, 7, 11, 13, 17, 19, 23, 29, 31, 37, 41, 43, 47]

求编写一个超级简单的Java的程序源代码

import java.awt.*;

import java.awt.event.*;

import javax.swing.*;

class ConstructFrame extends JFrame

{

private static final long serialVersionUID = 1L;

String value1="",result,value2="";

int flag=0,fix=0,sum=1;

Boolean happy;

JTextField text=new JTextField(30);

int flagsum=0;

Container c=getContentPane();

JButton buttonx;

ConstructFrame()

{ super("计算器");

c.setLayout(null);

c.setBackground(Color.blue);

this.setSize(400, 400);

c.add(text);

text.setHorizontalAlignment(JTextField.RIGHT);

final JButton buttonx=new JButton("BackSpace");

c.add(buttonx);

buttonx.addMouseListener(new MouseAdapter()

{

public void mousePressed(MouseEvent e)

{

int count=0;

String temp;

if(flag==0)

{

count=value1.length();

if(count!=1)

temp=value1.substring(0, count-1);

else

temp="0";

value1=temp;

}

else

{

count=value2.length();

if(count!=1)

temp=value2.substring(0, count-1);

else

temp="0";

value2=temp;

}

text.setText(temp);

}

});

final JButton buttony=new JButton("CE");

c.add(buttony);

buttony.addMouseListener(new MouseAdapter()

{

public void mousePressed(MouseEvent e)

{

value1="";

value2="";

flag=0;

text.setText("0");

}

});

final JButton button1=new JButton("1");

c.add(button1);

button1.addMouseListener(new MouseAdapter()

{

public void mousePressed(MouseEvent e)

{

String temp;

if(flag==0)

{

value1=value1+1;

temp=value1;

}

else

{

value2=value2+1;

temp=value2;

}

text.setText(temp);

}

});

final JButton button2=new JButton(" 2 ");

c.add(button2);

button2.addMouseListener(new MouseAdapter()

{

public void mousePressed(MouseEvent e)

{

String temp;

if(flag==0)

{

value1=value1+2;

temp=value1;

}

else

{

value2=value2+2;

temp=value2;

}

text.setText(temp);

}

});

final JButton button3=new JButton("3");

c.add(button3);

button3.addMouseListener(new MouseAdapter()

{

public void mousePressed(MouseEvent e)

{

String temp;

if(flag==0)

{

value1=value1+3;

temp=value1;

}

else

{

value2=value2+3;

temp=value2;

}

text.setText(temp);

}

});

final JButton button4=new JButton("4");

c.add(button4);

button4.addMouseListener(new MouseAdapter()

{

public void mousePressed(MouseEvent e)

{

String temp;

if(flag==0)

{

value1=value1+4;

temp=value1;

}

else

{

value2=value2+4;

temp=value2;

}

text.setText(temp);

}

});

final JButton button5=new JButton("5");

c.add(button5);

button5.addMouseListener(new MouseAdapter()

{

public void mousePressed(MouseEvent e)

{

String temp;

if(flag==0)

{

value1=value1+5;

temp=value1;

}

else

{

value2=value2+5;

temp=value2;

}

text.setText(temp);

}

});

final JButton button6=new JButton("6");

c.add(button6);

button6.addMouseListener(new MouseAdapter()

{

public void mousePressed(MouseEvent e)

{

String temp;

if(flag==0)

{

value1=value1+6;

temp=value1;

}

else

{

value2=value2+6;

temp=value2;

}

text.setText(temp);

}

});

final JButton button7=new JButton("7");

c.add(button7);

button7.addMouseListener(new MouseAdapter()

{

public void mousePressed(MouseEvent e)

{

String temp;

if(flag==0)

{

value1=value1+7;

temp=value1;

}

else

{

value2=value2+7;

temp=value2;

}

text.setText(temp);

}

});

final JButton button8=new JButton("8");

c.add(button8);

button8.addMouseListener(new MouseAdapter()

{

public void mousePressed(MouseEvent e)

{

String temp;

if(flag==0)

{

value1=value1+8;

temp=value1;

}

else

{

value2=value2+8;

temp=value2;

}

text.setText(temp);

}

});

final JButton button9=new JButton("9");

c.add(button9);

button9.addMouseListener(new MouseAdapter()

{

public void mousePressed(MouseEvent e)

{

String temp;

if(flag==0)

{

value1=value1+9;

temp=value1;

}

else

{

value2=value2+9;

temp=value2;

}

text.setText(temp);

}

});

final JButton button0=new JButton("0");

c.add(button0);

button0.addMouseListener(new MouseAdapter()

{

public void mousePressed(MouseEvent e)

{

String temp;

if(flag==0)

{

value1=value1+0;

temp=value1;

}

else

{

value2=value2+0;

temp=value2;

}

text.setText(temp);

}

});

final JButton buttonadd=new JButton(" + ");

c.add(buttonadd);

buttonadd.addMouseListener(new MouseAdapter()

{

public void mousePressed(MouseEvent e)

{

flag=1;

fix=1;

flagsum=0;

}

});

final JButton buttonsubtract=new JButton(" - ");

c.add(buttonsubtract);

buttonsubtract.addMouseListener(new MouseAdapter()

{

public void mousePressed(MouseEvent e)

{

flag=1;

fix=2;

flagsum=0;

}

});

final JButton buttoncheng=new JButton(" * ");

c.add(buttoncheng);

buttoncheng.addMouseListener(new MouseAdapter()

{

public void mousePressed(MouseEvent e)

{

flag=1;

fix=3;

flagsum=0;

}

});

final JButton buttonchu=new JButton(" / ");

c.add(buttonchu);

buttonchu.addMouseListener(new MouseAdapter()

{

public void mousePressed(MouseEvent e)

{

flag=1;

flagsum=0;

fix=4;

}

});

final JButton buttonequal=new JButton(" = ");

c.add(buttonequal);

buttonequal.addMouseListener(new MouseAdapter()

{

public void mousePressed(MouseEvent e)

{

double temp1,temp2;

double temp=0;

flagsum=0;

temp1=Double.parseDouble(value1);

temp2=Double.parseDouble(value2);

flag=0;

switch(fix)

{

case 1: temp=temp1+temp2;break;

case 2: temp=temp1-temp2;break;

case 3: temp=temp1*temp2;break;

case 4: temp=temp1/temp2;break;

}

result=Double.valueOf(temp).toString();

value1=result;

value2="";

flag=1;

text.setText(result);

}

});

final JButton buttonpoint=new JButton(".");

c.add(buttonpoint);

buttonpoint.addMouseListener(new MouseAdapter()

{

public void mousePressed(MouseEvent e)

{ if(flagsum==0)

{

String temp;

if(flag==0 )

{

value1=value1+".";

temp=value1;

}

else

{

value2=value2+".";

temp=value2;

}

flagsum=1;

text.setText(temp);

}

}

});

JButton buttonz=new JButton("Start");

c.add(buttonz);

buttonz.addMouseListener(new MouseAdapter()

{

public void mousePressed(MouseEvent e)

{ if(sum%2==1)

{

happy=true;

text.setText("0.");

flag=0;

}

else

{

happy=false;

value1="";

value2="";

text.setText("");

}

text.setEnabled(happy);

button1.setEnabled(happy);

button2.setEnabled(happy);

button3.setEnabled(happy);

button4.setEnabled(happy);

button5.setEnabled(happy);

button6.setEnabled(happy);

button7.setEnabled(happy);

button8.setEnabled(happy);

button9.setEnabled(happy);

button0.setEnabled(happy);

buttonx.setEnabled(happy);

buttony.setEnabled(happy);

buttonadd.setEnabled(happy);

buttonsubtract.setEnabled(happy);

buttonpoint.setEnabled(happy);

buttonequal.setEnabled(happy);

buttoncheng.setEnabled(happy);

buttonchu.setEnabled(happy);

sum++;

}

});

button1.setEnabled(false);

button2.setEnabled(false);

button3.setEnabled(false);

button4.setEnabled(false);

button5.setEnabled(false);

button6.setEnabled(false);

button7.setEnabled(false);

button8.setEnabled(false);

button9.setEnabled(false);

button0.setEnabled(false);

buttonx.setEnabled(false);

buttony.setEnabled(false);

buttonadd.setEnabled(false);

buttonsubtract.setEnabled(false);

buttonpoint.setEnabled(false);

buttonequal.setEnabled(false);

buttoncheng.setEnabled(false);

buttonchu.setEnabled(false);

text.setEnabled(false);

text.setBounds(20, 20, 200, 40);

buttonx.setBounds(20, 60,100, 40);

buttony.setBounds(140, 60,100, 40);

buttonz.setBounds(260, 60,80, 40);

button1.setBounds(20, 120,60, 40);

button2.setBounds(100, 120,60, 40);

button3.setBounds(180, 120,60, 40);

buttonadd.setBounds(260, 120,60, 40);

button4.setBounds(20, 180,60, 40);

button5.setBounds(100, 180,60, 40);

button6.setBounds(180, 180,60, 40);

buttonsubtract.setBounds(260, 180,60, 40);

button7.setBounds(20, 240,60, 40);

button8.setBounds(100, 240,60, 40);

button9.setBounds(180, 240,60, 40);

buttoncheng.setBounds(260,240,60,40);

button0.setBounds(20, 300,60, 40);

buttonpoint.setBounds(100, 300, 60, 40);

buttonequal.setBounds(180,300,60, 40);

buttonchu.setBounds(260, 300,60, 40);

setVisible(true);

}

class MYMouseEvent extends MouseAdapter

{

public void mousePressed(MouseEvent e)

{

value1=e.toString();

text.setText(value1);

}

}

}

class Calutator

{

public static void main(String[] args)

{

new ConstructFrame();

}

}

你自己慢慢的看吧！

帮忙给一个java菜单栏例子的源代码

给你个小例子，已经添加注释了。自己运行下看看效果，满意的话记得结贴子！

import java.awt.BorderLayout;

import java.awt.CheckboxMenuItem;

import java.awt.Frame;

import java.awt.Menu;

import java.awt.MenuBar;

import java.awt.MenuItem;

import java.awt.TextArea;

import java.awt.event.ActionEvent;

import java.awt.event.ActionListener;

import java.awt.event.WindowAdapter;

import java.awt.event.WindowEvent;

public class TestMenu extends Frame implements ActionListener{

TextArea ta; //文本区

MenuBar mb; //MenuBar 类封装绑定到框架的菜单栏的

Menu mnFile,mnEdit,mnFormat,mnHelp; //从菜单栏部署的下拉式菜单组件

MenuItem miNew,miOpen,miSave,miSaveAs,miExit,miFont; //菜单中的所有项必须属于类 MenuItem 或其子类之一

CheckboxMenuItem miBinary; //一个可包括在菜单中的复选框

public TestMenu(){

super("记事本"); //调用父类构造方法

ta = new TextArea("",20,20); //新建文本区，第一个参数是默认文本，第二个参数是行数，第三个是列数

/*

* BorderLayout边框布局

* 添加文本区到Frame，BorderLayout.CENTER是居中位置

* */

add(ta,BorderLayout.CENTER);

mb = new MenuBar(); //创建菜单栏对象

/*

* 创建菜单，指定菜单名

* */

mnFile= new Menu("文件");

mnEdit= new Menu("编辑");

mnFormat= new Menu("格式");

mnHelp= new Menu("帮助");

/*

* 创建子菜单，并指定名称

* */

miNew= new MenuItem("新建");

miOpen= new MenuItem("打开");

miSave= new MenuItem("保存");

miSaveAs= new MenuItem("另存为");

miExit= new MenuItem("退出");

miExit.addActionListener(this); //为退出菜单添加监听

/*

* 添加上面创建的子菜单到文件菜单下

* */

mnFile.add(miNew);

mnFile.add(miOpen);

mnFile.add(miSave);

mnFile.add(miSaveAs);

mnFile.addSeparator(); //将一个分隔线或连字符添加到菜单的当前位置

mnFile.add(miExit);

miBinary= new CheckboxMenuItem("二进制"); //创建在复选框的子菜单

miFont= new MenuItem("字体"); //创建子菜单

/*

* 添加miBinary、miFont两个子菜单到mnFormat（格式）下

* */

mnFormat.add(miBinary);

mnFormat.add(miFont);

/*

* 将文件、编辑、格式、帮助添加到菜单栏

* */

mb.add(mnFile);

mb.add(mnEdit);

mb.add(mnFormat);

mb.add(mnHelp);

setMenuBar(mb); //添加菜单栏到Frame

/*

* 关闭窗口时，关闭运行成语

* */

addWindowListener(new WindowAdapter(){

public void windowClosing(WindowEvent e){

System.exit(0);

}

});

}

public static void main(String args[]){

TestMenu tm=new TestMenu();

tm.setSize(300,200); //设置窗体的宽、高

tm.setLocation(300,100); //将组件移到新位置Component类方法

tm.setVisible(true); //设置显示窗体，true为显示，false为隐藏

}

/**

* 监听事件，实现ActionListener接口的actionPerformed方法

*/

public void actionPerformed(ActionEvent e){

String s = e.getActionCommand(); //获取选中菜单的名称

System.out.println(s);

if(s.equals("退出")){

System.exit(0); //停止运行程序

}

}

}

求一个简单java程序代码，谢谢

public class TestStar {

public static void main(String[] args) {

String star = "*";

for (int i = 0; i 5; i++) {

if (i == 0) {

System.out.print(" " + star);

System.out.println();

}

if (i == 1) {

for (int z = 0; z 4; z++) {

System.out.print(" " + star);

}

System.out.println();

}

if (i == 2) {

System.out.print(" ");

for (int x = 0; x 3; x++) {

System.out.print(" " + star);

}

System.out.println();

}

if (i == 3) {

for (int y = 0; y 2; y++) {

System.out.print(" " + star + " ");

}

}

}

}

}

是好使的 但是我没找到画五角星有什么规律（五角星好象不是正规图形吧？）如果还有什么要求的话 补充问题(如果是用*填充所有的东西 不包括 “ ”的话 我可以重新再给你写一个)