package 测试;

public class TestDemo {
	private static String getA() {return "a";}
	
	public static void test() {
		String a = "a";//a虽然是一个局部变量,也指向一个常量,但其引用上并未"强制约束"是不可改变的,因此编译器会认为这个变量可变
		final String c = "a";//final约束了c不可变.
		
		//三个变量结果为"ab"
		String b = a + "b";
		String d = c + "b";
		String e = getA() + "b";//编译器是不会看方法返回了什么内容
		
		String compare = "ab";
		System.out.println(b == compare);
		System.out.println(d == compare);
		System.out.println(e == compare);
	}

	public static void main(String[] args) {
		test();

	}

}
/*
 * 结果:false
 *      true
 *      false
 *      */