String Concatenation Demo - Java Example Program

class StringConcatDemo
{
    public static void main(String arg[])
    {
        String str1 = "Welcome ", str2 = " Merit", str3 = " Campus";
        int number = 2;
        str1 = str1 + number + str2 + str3; // LINE A
        System.out.println(str1);
        str2 = str2.concat(str3); // LINE B
        System.out.println(str2);
        boolean east = true;
        System.out.println("Sun rises in the east." + "\nThis statement is " + east); // LINE C
        str1 = null;
        // str1 = str1.concat(str2 + str3); // LINE D
        // str1 += number; // LINE E
        // System.out.println(str1);
        // System.out.println("Value=" + number + number); // LINE F
        // System.out.println("Value=" + ( number + number) ); // LINE G    
    }
}