谁能给我个java小程序代码和代码分析 急用

/** 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);
}
}

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关于死锁的。
/**
* This is a demonstration of how NOT to write multi-threaded programs.
* It is a program that purposely causes dea