wrapper class and normal string declaration gives same output?

I tried below given examples

String s=new String("cat");
    String s1=new String("cat");
    System.out.println(s==s1);
    System.out.println(s.equals(s1));

this gives me output false and true.

String s="cat";
String s1="cat";
System.out.println(s==s1);
System.out.println(s.equals(s1));

in this case the output of both is true may i know the difference between both i heard both wrapper class and normal string declaration gives same output