String Concatenation : String « Data Type « Java Tutorial

public class MainClass
   public static void main( String args[] )
      String s1 = new String( "Happy " );
      String s2 = new String( "Birthday" );

      System.out.printf( "s1 = %s\ns2 = %s\n\n",s1, s2 );
         "Result of s1.concat( s2 ) = %s\n", s1.concat( s2 ) );
      System.out.printf( "s1 after concatenation = %s\n", s1 );
   } // end main
s1 = Happy 
s2 = Birthday

Result of s1.concat( s2 ) = Happy Birthday
s1 after concatenation = Happy

2.19.1.Using String class
2.19.2.String Literals
2.19.3.String class constructors
2.19.4.Create String with char array
2.19.5.Length of a string
2.19.6.Assign String variable to null
2.19.7.Attempts to use string variable before it has been initialized
2.19.8.toLowerCase and toUpperCase
2.19.9.Comparing Two Strings
2.19.10.Demo for escape
2.19.11.Arrays of Strings: using 'new' operator
2.19.12.Arrays of Strings: Declare an array of String objects where the initial values determine the size of the array
2.19.13.String class substring methods
2.19.14.String Concatenation
2.19.15.String HashCode
2.19.16.Using trim() to process commands.
2.19.17.Remove leading and trailing white space from string
2.19.18.To remove a character
2.19.19.Remove a character at a specified position using String.substring
2.19.20.Get InputStream from a String
2.19.21.Demonstrate toUpperCase() and toLowerCase().
2.19.22.A string can be compared with a StringBuffer