Type in package java.lang

1.Boolean
It is rarely appropriate to use this constructor. Unless a new instance is required, the static factory valueOf(boolean) is generally a better choice. It is likely to yield significantly better space and time performance.

public void testBoolean() {
		long startTime = System.nanoTime();
		for (int i = 0; i < 1000; i++) {
			Boolean b = new Boolean(false);//Total: 167008 nanos.
			//Boolean b = Boolean.valueOf(false);//Total: 110343 nanos.
		}
		long endTime = System.nanoTime();
		System.out.println("Total: " + (endTime - startTime) + " nanos.");
	}