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How can I swap two strings without using a third variable in Java?
To swap the contents of two strings (say s1 and s2) without the third.
First of all concatenate the given two strings using the concatenation operator “+” and store in s1 (first string).
s1 = s1+s2;
The substring method of the String class is used to this method has two variants and returns a new string that is a substring of this string. The substring begins with the character at the specified index and extends to the end of this string or up to endIndex – 1, if the second argument is given.
Now using the substring() method of the String class store the value of s1 in s2 and vice versa.
s2 = s1.substring(0,i); s1 = s1.substring(i);
Example
public class Sample {
public static void main(String args[]){
String s1 = "tutorials";
String s2 = "point";
System.out.println("Value of s1 before swapping :"+s1);
System.out.println("Value of s2 before swapping :"+s2);
int i = s1.length();
s1 = s1+s2;
s2 = s1.substring(0,i);
s1 = s1.substring(i);
System.out.println("Value of s1 after swapping :"+s1);
System.out.println("Value of s2 after swapping :"+s2);
}
}Output
Value of s1 before swapping :tutorials Value of s2 before swapping :point Value of s1 after swapping :point Value of s2 after swapping :tutorials
Updated on: 30-Jul-2019
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