Analyzing equal java

A String

1.equals (): String objects or equal to two equal content recommendation

String a=new String("abc"); 
String b=new String("abc");
a.equals(b);

2. = =: compare Address

String c="123";
String d="123";
System.out.println (C == D);   // to true, the value in the java string is not altered, the same string will keep a copy in memory, so the points a and b are the same objects;

String a=new String("abc");
String b=new String("abc");
System.out.println (C == D); // to false, a and b at this time point to a different object.

= = Is more memory addresses, memory addresses are equal, it returns true, equal address, definitely value too, addresses are not equal, even if the values ​​are equal will return false,

String object type, it is not a simple "==" is determined.

The use equals () method, String override the equals, regardless of whether the same address, only compare values, the values ​​are equal returns true, not equal returns false.