Java String type

In this chapter you will learn:

1. How to declare Java String type
2. Literals for Java String types
3. Example - Java String type
4. What are the difference between equals() and ==

Description

The String class represents character strings. A quoted string constant can be assigned to a String variable.

Literal

String literals in Java are specified by enclosing a sequence of characters between a pair of double quotes. In Java strings are actually object types.

Example

Declare String type variable.

public class Main{
   public static void main(String[] argv){
      String str = "this is a test from java2s.com"; 
      System.out.println(str);/*from   www.  j  a v a  2 s .co  m*/
    }
}

The output:

equals() vs ==

equals( ) method and the == operator perform two different operations. equals( ) method compares the characters inside a String object. The == operator compares two object references to see whether they refer to the same instance.

The following program shows the differences:

 
public class Main {
  public static void main(String args[]) {
    String s1 = "demo2s.com";
    String s2 = new String(s1);
/* ww  w  . java2 s .  c  o  m*/
    System.out.println(s1 + " equals " + s2 + " -> " + s1.equals(s2));
    System.out.println(s1 + " == " + s2 + " -> " + (s1 == s2));
  }
}

Here is the output of the preceding example:

Next chapter...

What you will learn in the next chapter:

1. How to escape Java String Literals
2. Syntax for String escape
3. List value for string escape
4. Example - Escape string value
5. Example - Java strings must begin and end on the same line

Java String type