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Програмування мовою Java
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public abstract class SomeClass implements Runnable {
public final static Object one = new Object (), two = new Object ();
public static void main (String s []) {
Thread t1 = new Thread () {
public void run () {
synchronized (one) {
try {
Thread.sleep (1000);
} Catch (InterruptedException e) {
e.printStackTrace ();
}
synchronized (two) {
System.out.print ( "1");
}
}
}
};
Thread t2 = new Thread () {
public void run () {
synchronized (two) {
synchronized (one) {
System.out.print ( "2");
}
}
}
};
t1.start ();
t2.start ();
}
}
(Java)
int i = 0;
while (i <4) {
System.out.print (i);
if (i> = 2)
try {
throw new ArithmeticException ( "ex");
}
catch (ArithmeticException e) {
System.out.print (i);
break;
}
i ++;
}
(Java)
(Java)
1 class A {
2 final int a = 5;
3 protected double c;
4 protected int q;
5 private int j;
6}
7 class B extends A {
8 int c;
9 B (int b1, int b2) {
10 super ();
11 c = b1;
12}
13}
Object
java.lang
lang
java.lang.Object
(Java)
public abstract class SomeClass implements Runnable {
private Object lock = new Object ();
public void lock () {
synchronized (lock) {
try {
System.out.print ( "1");
lock.wait ();
} Catch (InterruptedException e) { }
}
}
public void unlock () {
synchronized (lock) {
lock.notify ();
System.out.print ( "2");
}
}
public static void main (String s []) {
new Thread (new SomeClass () {
public void run () {
lock ();
}
}). Start ();
new Thread (new SomeClass () {
public void run () {
unlock ();
}
}). Start ();
}
}
(Java)
1 package newpack;
2 class A {
3 int a, b;
4 void sum () {
5 System.out.print (a + b);
6}
7}
8 class B extends A {
9 ...
10}
11 ...