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public class Test {
public static void main(String[] args) {
StringBuffer sbf = new StringBuffer();
StringBuilder sb = new StringBuilder();
//10个线程
for (int i = 0; i < 10; i++) {
new Thread(new TestThread(sbf, sb)).start();
}
}
}
class TestThread implements Runnable {
StringBuffer sbf;
StringBuilder sb;
TestThread(StringBuffer sbf, StringBuilder sb) {
this.sb = sb;
this.sbf = sbf;
}
@Override
public void run() {
for (int i = 0; i < 100; i++) {
try {
Thread.sleep(10);
} catch (InterruptedException e) {
e.printStackTrace();
}
sb.append("1");
sbf.append("1");
System.out.println(sb.length() + "/" + sbf.length());
}
}
}
public class Test3 implements Runnable {
// StringBuilder builder = new StringBuilder();
StringBuffer buffer=new StringBuffer();
public void run() {
try {
Thread.sleep((int)(Math.random() * 2));
}
catch (InterruptedException e) {
e.printStackTrace();
}
// builder.append(1);
buffer.append(1);
}
public static void main(String[] args) throws InterruptedException {
ThreadGroup group = new ThreadGroup("testgroup");
Test3 t = new Test3();
for (int i = 0; i < 100000; i++) {
Thread th = new Thread(group, t, String.valueOf(i));
th.start();
}
while (group.activeCount() > 0) {
Thread.sleep(10);
}
// 如果长度为100000就是安全的
// System.out.println(t.builder.length());
System.out.println(t.buffer.length());
}
}
package cn.dzr.thread;
import org.omg.PortableInterceptor.CurrentHelper;
class DelStr implements Runnable
{
StringBuilder sb;
DelStr(StringBuilder sb)
{
this.sb = sb;
}
public void run()
{
for(int i =0;i<sb.length();)
{
try
{
Thread.sleep(10);
}
catch (InterruptedException e)
{
e.printStackTrace();
}
sb.deleteCharAt(i);
}
}
}
public class StringBuilderTest
{
public static void main(String[] args)
{
StringBuilder sb = new StringBuilder("abcdefgh");
new Thread(new DelStr(sb)).start();
new Thread(new DelStr(sb)).start();
}
}