what are string api in java code example

Example 1: string java

System.out.println("abc");
     String cde = "cde";
     System.out.println("abc" + cde);
     String c = "abc".substring(2,3);
     String d = cde.substring(1, 2);

Example 2: string java

char data[] = {'a', 'b', 'c'};
     String str = new String(data);