java equals() and equalsIgnoreCase() method

class sm5
{
	public static void main(String args[])
	{
		String str1="INDIA";
		String str2="INDIA";
		String str3=new String("INDIA");
		String str4=new String("INDIA");
		String str5=new String("India");
		System.out.println(str1==str2);//True
		System.out.println(str3==str4);//False
		System.out.println(str3.equals(str4));//True
		System.out.println(str4.equalsIgnoreCase(str5));//True
	}
}