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java高级代码案例,java优秀代码案例
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求一个JAVA多线程例子，最好有代码，谢谢啦！
package a.b.test;
import java.util.Date;
import java.util.concurrent.Callable;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;
import java.util.concurrent.Future;
public class Calculate1000 implements CallableInteger{
public Calculate1000(){}
public Calculate1000(int a, int b){
this.a = a;
this.b = b;
}
int a;
int b;
/**
* @param args
* @throws Exception
*/
public static void main(String[] args) throws Exception {
//同步
Calculate1000 ca1 = new Calculate1000();
Date ds1 = new Date();
int result = 0;
for(int i = 1 ; i = 1000 ; i++){
result = ca1.add(i, result);
}
System.out.println(result);
System.out.println("同步用时" + (new Date().getTime() - ds1.getTime()) + "MS");
//异步
Date ds2 = new Date();
result = 0;
ExecutorService es = Executors.newFixedThreadPool(2);
FutureInteger future1 = es.submit(new Calculate1000(1,500));
FutureInteger future2 = es.submit(new Calculate1000(501,1000));
result = future1.get() + future2.get();
System.out.println(result);
System.out.println("异步用时" + (new Date().getTime() - ds2.getTime()) + "MS");
es.shutdown();
}
private int add(int a, int b) throws Exception{
Thread.sleep(10);
return a + b;
}
@Override
public Integer call() throws Exception {
int res = 0;
for(int i = a ; i = b ; i++){
res = this.add(res, i);
}
return res;
}
}
楼主你试一下这段代码行不行，行的话请采纳！
相关问答
Q1: JAVA多线程 编程题两个案例，不会写，求大神写出代码，万分感谢，多线程还没学。
/*
class A extends Thread
{
public void run()
{
try
{
Thread.sleep(1000);
}catch(Exception e)
{
System.out.println("A ERROR!");
}
System.out.println("AAAA");
}
}
class B extends Thread
{
public void run()
{
try
{
Thread.sleep(2000);
}catch(Exception e)
{
System.out.println("B ERROR!");
}
System.out.println("BBBB");
}
}
class C extends Thread
{
public void run()
{
try
{
Thread.sleep(3000);
}catch(Exception e)
{
System.out.println("C ERROR!");
}
System.out.println("CCCC");
}
}
public class Test_1
{
public static void main(String[] args)
{
A a = new A();
B b = new B();
C c = new C();
a.start();
b.start();
c.start();
}
}*/
public class Test_1
{
public static void main(String[] args)
{
A a = new A();
B b = new B();
C c = new C();
Thread ta = new Thread(a);
Thread tb = new Thread(b);
Thread tc = new Thread(c);
ta.start();
tb.start();
tc.start();
}
}
class A implements Runnable
{
public void run()
{
try
{
Thread.sleep(1000);
}catch(Exception e)
{
System.out.println("A ERROR!");
}
System.out.println("AAAA");
}
}
class B implements Runnable
{
public void run()
{
try
{
Thread.sleep(2000);
}catch(Exception e)
{
System.out.println("B ERROR!");
}
System.out.println("BBBB");
}
}
class C implements Runnable
{
public void run()
{
try
{
Thread.sleep(3000);
}catch(Exception e)
{
System.out.println("C ERROR!");
}
System.out.println("CCCC");
}
}
案例一的两种方法已经写好；现在有事，晚上再把案例二代码写一下，应该没关系吧！
抱歉，是一个线程类，我看错了，晚上重发一下代码！
Q2: 编写一个Java程序 要完整的代码
public class Compute{
public static void main(String args [])
{
int a = 2;
float b = 2;
double c = 2;
Compute com1 = new Compute();
System.out.println(com1.mySqr(a));
System.out.println(com1.mySqr(b));
System.out.println(com1.mySqr(c));
}
public int mySqr(int x)
{
int value = x*x;
return value;
}
public float mySqr(float x)
{
float value = x*x;
return value;
}
public double mySqr(double x)
{
double value = x*x;
return value;
}
}
Q3: java线程经典代码
package threadgroup;
class ThreadDemo3 extends Thread {
private String name;
private int delay;
public ThreadDemo3(String sname, int i_delay) {
name = sname;
delay = i_delay;
}
public void run() {
try {
sleep(delay);
} catch (InterruptedException e) {
}
System.out.println("多线程测试！\n" + name + "\n" + delay);
}
}
public class testMyThread {
public static void main(String[] args) {
ThreadDemo3 th1,th2,th3;
th1 = new ThreadDemo3("线程1", (int) (Math.random() * 900));
th2 = new ThreadDemo3("线程2", (int) (Math.random() * 900));
th3 = new ThreadDemo3("线程3", (int) (Math.random() * 900));
th1.start();
th2.start();
th3.start();
}
}
package threadgroup;
public class threadDemo {
public static void main(String[] args) {
Thread t = Thread.currentThread();
t.setName("你好吗？");
System.out.println("正在进行的Thread是：" + t);
try {
for (int i = 0; i 5; i++) {
System.out.println("我不叫穆继超" + i);
Thread.sleep(3000);
}
} catch (Exception e) {
// TODO: handle exception
System.out.println("Thread has wrong" + e.getMessage());
}
}
}
package threadgroup;
public class threadDemo2 implements Runnable {
public threadDemo2() {
Thread t1 = Thread.currentThread();
t1.setName("第一个主进程");
System.out.println("正在运行" + t1);
Thread t2 = new Thread(this, "");
System.out.println("在创建一个进程");
t2.start();
try {
System.out.println("使他进入第一个睡眠状态");
Thread.sleep(2000);
} catch (InterruptedException e) {
System.out.println("Thread has wrong" + e.getMessage());
}
System.out.println("退出第一个进程");
}
public void run() {
try {
for (int i = 0; i 5; i++) {
System.out.println("进程" + i);
Thread.sleep(3000);
}
} catch (InterruptedException e) {
// TODO: handle exception
System.out.println("Thread has wrong" + e.getMessage());
}
System.out.println("退出第二个进程");
}
public static void main(String[] args) {
new threadDemo2();
}
}
Q4: 使用Java代码实现如下案例:+遍历1-100中的数字,求解1-100中所有偶数之和;+提？
public static void main(String[] args) {
int total = 0;
for(int i=1;i=100;i++) {
if(i%2 == 0) {
total = total+i;
}
}
System.out.println("1-100偶数之和为:"+total);
}
Q5: java代码示例
importjava.awt.*;importjava.awt.event.*;classShopFrameextendsFrameimplementsActionListener{Labellabel1,label2,label3,label4;Buttonbutton1,button2,button3,button4,button5;TextAreatext;Panelpanel1,panel2;staticfloatsum=0.0f;ShopFrame(Strings){super(s);setLayout(newBorderLayout());label1=newLabel("面纸：3元",Label.LEFT);label2=newLabel("钢笔：5元",Label.LEFT);label3=newLabel("书：10元",Label.LEFT);label4=newLabel("袜子：8元",Label.LEFT);button1=newButton("加入购物车");button2=newButton("加入购物车");button3=newButton("加入购物车");button4=newButton("加入购物车");button5=newButton("查看购物车");text=newTextArea("商品有："+"\n",5,10);text.setEditable(false);addWindowListener(newWindowAdapter(){publicvoidwindowClosing(WindowEvente){System.exit(0);}});button1.addActionListener(this);button2.addActionListener(this);button3.addActionListener(this);button4.addActionListener(this);button5.addActionListener(this);panel1=newPanel();panel2=newPanel();panel1.add(label1);panel1.add(button1);panel1.add(label2);panel1.add(button2);panel1.add(label3);panel1.add(button3);panel1.add(label4);panel1.add(button4);panel2.setLayout(newBorderLayout());panel2.add(button5,BorderLayout.NORTH);panel2.add(text,BorderLayout.SOUTH);this.add(panel1,BorderLayout.CENTER);this.add(panel2,BorderLayout.SOUTH);setBounds(100,100,350,250);setVisible(true);validate();}publicvoidactionPerformed(ActionEvente){if(e.getSource()==button1){text.append("一个面纸、");sum=sum+3;}elseif(e.getSource()==button2){text.append("一只钢笔、");sum=sum+5;}elseif(e.getSource()==button3){text.append("一本书、");sum=sum+10;}elseif(e.getSource()==button4){text.append("一双袜子、");sum=sum+8;}elseif(e.getSource()==button5){text.append("\n"+"总价为："+"\n"+sum);}}}publicclassShopping{publicstaticvoidmain(String[]args){newShopFrame("购物车");}}我没用Swing可能显示不出来你的效果。不满意得话我在给你编一个。
