谁能给我个java小程序代码和代码分析 急用

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/** This class demonstrates how you might use the Rect class */
public class RectTest {
public static void main(String[] args) {
Rect r1 = new Rect(1, 1, 4, 4); // Create Rect objects
Rect r2 = new Rect(2, 3, 5, 6);
Rect u = r1.union(r2); // Invoke Rect methods
Rect i = r2.intersection(r1);

if (u.isInside(r2.x1, r2.y1)) // Use Rect fields and invoke a method
System.out.println("(" + r2.x1 + "," + r2.y1 +
") is inside the union");

// These lines implicitly call the Rect.toString() method
System.out.println(r1 + " union " + r2 + " = " + u);
System.out.println(r1 + " intersect " + r2 + " = " + i);
}
}

******************************************************************
关于死锁的。
/**
* This is a demonstration of how NOT to write multi-threaded programs.
* It is a program that purposely causes deadlock between two threads that
* are both trying to acquire locks for the same two resources.
* To avoid this sort of deadlock when locking multiple resources, all threads
* should always acquire their locks in the same order.
**/
public class Deadlock {
public static void main(String[] args) {
// These are the two resource objects we'll try to get locks for
final Object resource1 = "resource1";
final Object resource2 = "resource2";
// Here's the first thread. It tries to lock resource1 then resource2
Thread t1 = new Thread() {
public void run() {
// Lock resource 1
synchronized(resource1) {
System.out.println("Thread 1: locked resource 1");

// Pause for a bit, simulating some file I/O or
// something. Basically, we just want to give the
// other thread a chance to run. Threads and deadlock
// are asynchronous things, but we're trying to force
// deadlock to happen here...
try { Thread.sleep(50); }
catch (InterruptedException e) {}

// Now wait 'till we can get a lock on resource 2
synchronized(resource2) {
System.out.println("Thread 1: locked resource 2");
}
}
}
};

网上有好多搜的.