String equality and operators

Concatenation: + and +=

package com.test.test1;
public class StringMethods {
	public static void main(String[] args) {
		String day = "OCJA" + "Cert" + "Exam";
		System.out.println(day);
	}
}

package com.test.test1;
public class StringMethods {
	public static void main(String[] args) {
		int num = 10;
		int val = 12	;
		String aStr = "OCJA";
		String anotherStr = num + val + aStr;
		System.out.println(anotherStr);
	}
}

package com.test.test1;
public class StringMethods {
	public static void main(String[] args) {
		int num = 10;
		int val = 12;
		String aStr = "OCJA";
		String anotherStr = "" + num + val + aStr;
		System.out.println(anotherStr);
	}
}

package com.test.test1;
public class StringMethods {
	public static void main(String[] args) {
		String lang = "Java";
		lang += " is everywhere!";
		String initializedToNull = null;
		initializedToNull += "Java";
		System.out.println(initializedToNull);
	}
}