☞We can compare string in java on the basis of content and reference.
☞There are 3 ways to compare string in java.
1. By equals() method 2. By == operator 3. By compareTo() method
☞It compares the original content of the string.
☞String class provides two methods :
1. equals() method 2. equalsIgnoreCase() method
class EqualsExample{ public static void main(String args[]){ String s1="Avlokan"; String s2="Avlokan"; String s3=new String("Avlokan"); String s4="Mohan"; String s5="AVLOKAN"; System.out.println(s1.equals(s2)); System.out.println(s1.equals(s3)); System.out.println(s1.equals(s4)); System.out.println(s1.equals(s5)); System.out.println(s1.equalsIgnoreCase(s5)); } }
true true false false true
☞It compares refernces not values.
class EqualsExample{ public static void main(String args[]){ String s1="Avlokan"; String s2="Avlokan"; String s3=new String("Avlokan"); String s4=new String("Avlokan"); System.out.println(s1==s2); System.out.println(s1==s3); System.out.println(s3==s4); } }
true false false
☞It compares values lexicographically and returns an integer value.
☞Suppose str1 and str2 are two string variables.
1. If str1 == str2, then output will be 0 2. If str1 > str2, then output will be positive value 3. If str1 < str2, then output will be negative value
class CompareToExample{ public static void main(String args[]){ String s1="Avlokan"; String s2="Avlokan"; String s3=new String("Avlokan"); String s4=new String("Avlokan"); String s5="Mohan"; System.out.println(s1.compareTo(s2)); System.out.println(s1.compareTo(s3)); System.out.println(s3.compareTo(s4)); System.out.println(s1.compareTo(s5)); System.out.println(s5.compareTo(s1)); } }
0 0 0 -12 12