Java线程：线程的同步与锁
一、同步问题提出
线程的同步是为了防止多个线程访问一个数据对象时，对数据造成的破坏。
例如：两个线程ThreadA、ThreadB都操作同一个对象Foo对象，并修改Foo对象上的数据。
public class Foo {
private int x = 100;
public int getX() {
return x;
}
public int fix(int y) {
x = x - y;
return x;
}
}
public class MyRunnable implements Runnable {
private Foo foo = new Foo();
public static void main(String[] args) {
MyRunnable r = new MyRunnable();
Thread ta = new Thread(r, "Thread-A");
Thread tb = new Thread(r, "Thread-B");
ta.start();
tb.start();
}
public void run() {
for (int i = 0; i < 3; i++) {
this.fix(30);
try {
Thread.sleep(1);
} catch (InterruptedException e) {
e.printStackTrace();
}
&nb
java写文件乱码
StringBuffer sb = new StringBuffer();
sb.append("<table border=\"0\" width=\"100%\" cellpadding=\"0\" cellspacing=\"1\" bgcolor=\"b5d6e6\"");
sb.append("<tr>");
sb.append("<td bgcolor=\"#FFFFFE\" height=\"42\" colspan=\""+ (jsd ......
1.
public class EasyError1 {
class Student {
private String name;
public String getName() {
......
