java

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package test;

import java.io.BufferedReader;
import java.io.File;
import java.io.FileOutputStream;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.OutputStreamWriter;
import java.net.URL;
import java.util.Arrays;
import java.util.regex.Matcher;
import java.util.regex.Pattern;

public class B {
public static void main(String[] args) {
// way_1();
way_3();
// System.out.println(subStringByBytes("我ABC汉DEF", 6,"gbk"));
}

public void way(){
int[] a = new int[] { 10, 9,12, -70000, -90000, -600000,
-500000, -32769 };

Arrays.sort(a);

for(int i=0;i<a.length-1;i++)

{

System.out.print(a[i]+" ");

}
System.out.println();
int j = a.length-3;

System.out.println(a[j]+"--");
}

public static void way_1() {
try {



InputStream inputStream;//接收字节输入流
InputStreamReader inputStreamReader;//将字节输入流转换成字符输入流
BufferedReader bufferedReader;//为字符输入流加缓冲
FileOutputStream fileOutputStream;//字节输出流
OutputStreamWriter outputStreamWriter;//将字节输出流转换成字符输出流

URL wangyi = new URL("http://www.runoob.com/");
inputStream = wangyi.openStream();
inputStreamReader = new InputStreamReader(inputStream, "utf-8");
bufferedReader = new BufferedReader(inputStreamReader);
String s;
File dest = new File("src/test/wangyi.txt");
fileOutputStream = new FileOutputStream(dest);
outputStreamWriter = new OutputStreamWriter(fileOutputStream, "utf-8");

String regex = "<a[\\s]+href[\\s]*=[\\s]*\"([^<\"]+)\"";
//String regex = "[^.]";
Pattern p = Pattern.compile(regex, Pattern.CASE_INSENSITIVE);

while ((s = bufferedReader.readLine()) != null) {
System.out.println(s);

Matcher m = p.matcher(s);

StringBuffer ret = new StringBuffer();
while(m.find())
{
ret.append(m.group(1));
}

String url = ret.toString();
System.out.println("===="+url);

outputStreamWriter.write(s);
}

outputStreamWriter.close();
fileOutputStream.close();
bufferedReader.close();
inputStreamReader.close();
inputStream.close();
} catch (Exception e) {
e.printStackTrace();
}

}

/**
*
* @param str 要截取的字符串
* @param bytes 截取的字节数
* @return
* @throws UnsupportedEncodingException
*/
public static String subStringByBytes(String str, int bytes,String charSetName){
String subAfter = str.substring(0, bytes);
int temp = bytes;
try {
//直到截取的字符串的字节数和需要的截取的字节数相等位为止
while(bytes < subAfter.getBytes(charSetName).length){
subAfter = subAfter.substring(0,--temp );
}
} catch (Exception e) {
e.printStackTrace();
}
return subAfter;
}
/**
*
* @return 当前系统的编码格式
*/
public static String getSystemEncode() {
System.getProperties().list(System.out);// 得到当前的系统属性。并将属性列表输出到控制台
String encoding = System.getProperty("file.encoding");
System.out.println("Encoding:" + encoding);
return encoding;
}

public static void way_3(){

final int count = 200;
new Thread(){
public void run() {
for(int i = 1; i <= count ;i=i+2) {
// 奇数，起始值为1，增长步长为2
try {
System.out.println("奇数线程：\t" + i);
// 暂停0.5秒
sleep(1);
} catch (InterruptedException e) {
e.printStackTrace();
}
}
};
}.start();
new Thread(){
public void run() {
for(int i = 0; i <= count ;i=i+2) {
// 偶数，起始值为0，增长步长为2
try {
System.out.println("偶数线程：\t" + i);
// 暂停0.5秒
sleep(1);
} catch (InterruptedException e) {
e.printStackTrace();
}
}
};
}.start();
}

}

===================================================

package test;

//要打印的资源
public class Num {
int ji=3;
int ou=2;
boolean flag = false; //两个线程，交替执行的一个标志
}

=====================================================

package test;

public class PrintMain {
public static void main(String[] args) {
Num num = new Num(); //声明一个资源

PrintQi pQi = new PrintQi(num);
PrintOu pOu = new PrintOu(num);

Thread aThread = new Thread(pQi);
Thread bThread = new Thread(pOu);

aThread.start();
bThread.start();
}
}

=================================================================

package test;

//打印偶数的线程
public class PrintOu implements Runnable{
Num num;
public PrintOu(Num num) {
this.num = num;
}
public void run()
{
int i = 1;
while(i<=100)
{

synchronized (num)/* 必须要用一把锁对象，这个对象是num*/ {
if(!num.flag) {
try {
num.wait(); //操作wait()函数的必须和锁是同一个
} catch (Exception e) {
e.printStackTrace();
}
}
else {

System.out.println("2的倍数====="+num.ou * i);
i++;
try {
num.wait(5L);
} catch (InterruptedException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
num.flag = false;
num.notify();
}
}
}
}
}

========================================================================

package test;

//打印奇数的线程
public class PrintQi implements Runnable{
Num num ;
public PrintQi(Num num)
{
this.num = num;
}
public void run()
{
int i = 1;
while(i <= 100)
{
synchronized (num) {
if(num.flag)
{
try {
num.wait();
} catch (Exception e) {
}
}
else {

System.out.println("3的倍数-----"+num.ji * i);
i++;
try {
num.wait(5L);
} catch (InterruptedException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
num.flag = true;
num.notify();
}
}
}
}
}v

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