compareToメソッド

//Sample_compareTo.java
class Sample_compareTo{
    public static void main(String[] args){
      String str1 = "あいうえお";
      String str2 = "かきくけこ";
      int num = str1.compareTo(str2);
      if(num<0){
          System.out.println("str1 の方が前。num= " + num);
      }else if(num>0){
          System.out.println("str1 の方が後。num= " + num);
      }else{
          System.out.println("str1 と str2 は同じ。num= " + num);
      }

    }
}

>cd ws
ws>javac -encoding UTF-8 Sample_compareTo.java
ws>java Sample_compareTo
str1 の方が前。num= -9