C# java 的 equals 与 == 的区别

C# 

            String a = "宜春";
            String b = new String(new char[] { '宜', '春' });
            String c = b; //注意这里是引用传递，意思是c也指向b指向的内存地址

            bool r1 = a == b;  //true
            bool r2 = a == c;  //true
            bool r3 = b == c;  //true
            bool r4 = a.Equals(b);  //true
            bool r5 = a.Equals(c);  //true
            bool r6 = b.Equals(c);  //true