[JAVA] About size comparison of compareTo

About CompareTo As a result of the value, you may forget which comparison is which value, so make a note.

** ① compareTo () ** when comparing by character string


public class Test {
	public static void main(String[] args) {
		 String a = "a";
		 String b = "b";
		 System.out.println(a.compareTo(b));
		 System.out.println(b.compareTo(a));
		 System.out.println(a.compareTo(a));
	}
}

Below is the execution result.

-1
1
0

Returns -1 or 1 if the characters are lexicographically separated. -1 because a is before b b is after a, so 1 0 if they are the same

** ② Integer.compare () ** for numerical comparison


public class Test {
	public static void main(String[] args) {
		 int one = 1;
		 int two = 2;
		 System.out.println(Integer.compare(one,two));
		 System.out.println(Integer.compare(two,one));
		 System.out.println(Integer.compare(one,one));
	}
}

Below is the execution result.

-1
1
0

Simply the calculation result. 1-2=-1 2-1=1 1-1 = 0.

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