How do you compare two strings in java?

Question:

How do you compare two string in java?

Code:

public class CompareStrings { 
   public static void main(String[] args) { 
      String str1 = "foo"; 
      String str2 = "foo"; 
      String str3 = "FOO"; 
 
      System.out.println("str1: " + str1); 
      System.out.println("str2: " + str2); 
 
 
      // java String comparison with the equals method
      if ( str1.equals(str2) ){
       System.out.println("str1 and str2 are the same"); 
      }
 
      // java String comparison with the equalsIgnoreCase method
      if ( str1.equalsIgnoreCase(str3)) {
       System.out.println("str1 and str3 match ignooring case"); 
      }
 
 
      // java String comparison with the compareTo method
      if ( str1.compareTo(str2) == 0) {
       System.out.println("str1 and str2 are the same"); 
      }
 
 
      // java String comparison with the compareToIgnoreCase method
      if ( str1.compareToIgnoreCase(str3) == 0) {
       System.out.println("str1 and str3 match ignooring case"); 
      }
 
   }
}

Output:

$ java CompareStrings 
str1: foo
str2: foo
str1 and str2 are the same
str1 and str3 match ignooring case
str1 and str2 are the same
str1 and str3 match ignooring case