jls15_35.java

class ArrayReferenceThrow extends RuntimeException { }
class IndexThrow extends RuntimeException { }
class RightHandSideThrow extends RuntimeException { }
class IllustrateSimpleArrayAssignment {
	static Object[] objects = { new Object(), new Object() };
	static Thread[] threads = { new Thread(), new Thread() };
	static Object[] arrayThrow() {
		throw new ArrayReferenceThrow();
	}
	static int indexThrow() { throw new IndexThrow(); }
	static Thread rightThrow() {
		throw new RightHandSideThrow();
	}
	static String name(Object q) {
		String sq = q.getClass().getName();
		int k = sq.lastIndexOf('.');
		return (k < 0) ? sq : sq.substring(k+1);
	}
	static void testFour(Object[] x, int j, Object y) {
		String sx = x == null ? "null" : name(x[0]) + "s";
		String sy = name(y);
		System.out.println();
		try {
			System.out.print(sx + "[throw]=throw => ");
			x[indexThrow()] = rightThrow();
			System.out.println("Okay!");
		} catch (Throwable e) { System.out.println(name(e)); }
		try {
			System.out.print(sx + "[throw]=" + sy + " => ");
			x[indexThrow()] = y;
			System.out.println("Okay!");
		} catch (Throwable e) { System.out.println(name(e)); }
		try {
			System.out.print(sx + "[" + j + "]=throw => ");
			x[j] = rightThrow();
			System.out.println("Okay!");
		} catch (Throwable e) { System.out.println(name(e)); }
		try {
			System.out.print(sx + "[" + j + "]=" + sy + " => ");
			x[j] = y;
			System.out.println("Okay!");
		} catch (Throwable e) { System.out.println(name(e)); }
	}
	public static void main(String[] args) {
		try {
			System.out.print("throw[throw]=throw => ");
			arrayThrow()[indexThrow()] = rightThrow();
			System.out.println("Okay!");
		} catch (Throwable e) { System.out.println(name(e)); }
		try {
			System.out.print("throw[throw]=Thread => ");
			arrayThrow()[indexThrow()] = new Thread();
			System.out.println("Okay!");
		} catch (Throwable e) { System.out.println(name(e)); }
		try {
			System.out.print("throw[1]=throw => ");
			arrayThrow()[1] = rightThrow();
			System.out.println("Okay!");
		} catch (Throwable e) { System.out.println(name(e)); }
		try {
			System.out.print("throw[1]=Thread => ");
			arrayThrow()[1] = new Thread();
			System.out.println("Okay!");
		} catch (Throwable e) { System.out.println(name(e)); }
		testFour(null, 1, new StringBuffer());
		testFour(null, 1, new StringBuffer());
		testFour(null, 9, new Thread());
		testFour(null, 9, new Thread());
		testFour(objects, 1, new StringBuffer());
		testFour(objects, 1, new Thread());
		testFour(objects, 9, new StringBuffer());
		testFour(objects, 9, new Thread());
		testFour(threads, 1, new StringBuffer());
		testFour(threads, 1, new Thread());
		testFour(threads, 9, new StringBuffer());
		testFour(threads, 9, new Thread());
	}
}