Question

Let's assume

String a = "123";
String c = "123";
String b =  new String(a);

Which of the following expression is True

		c == b
		a.compareTo(c)>0
		c.equals(b)
		a == b
		b.equals(a)

Answer 1

• The expression c.equals(b) and b.equals(a) is true because of the following reasons:
• String is immutable(once it is created its state cannot be change)
• when we create string a="123" string b="123" both a and b are pointing to same memory location
• But when we create new object of string we assing new value to it and the refrance vaiable will point to new memory location(Heap memory)
• But now when we use equals() method then this equals method compare content of the string rather than Heap refrance pointer hence we get True when we compare c.equals(b) and b.equals(a)
• Whereas compare method will return integer value based on the unicode of the string thats why it is not True expression.
• for better understandin below code i am sharing
• in below code compiler print "Hii" if two string are equal else it will print "Hello"

public class Main {
   public static void main(String[] args) {
       String a = "123";
       String c = "123";
       String b = new String(a);
         
       if (c.equals(b))
       {
           System.out.println("hii");
       }
       else
       {
           System.out.println("hello");
       }
         
      
   }

}

Hope this code will help you

Thank You!!