Get string's substring Before Last - Java java.lang

Introduction

The following code shows how to substring Before Last

Demo Code

public class Main {
  public static void main(String[] argv) {
    String str = "java2s.com";
    String separator = "2s.com";
    System.out.println(substringBeforeLast(str, separator));
  }//from w ww  .  ja va2  s.  c  o  m

  public static final int INDEX_NOT_FOUND = -1;

  public static String substringBeforeLast(String str, String separator) {
    if (isEmpty(str) || isEmpty(separator)) {
      return str;
    }
    int pos = str.lastIndexOf(separator);
    if (pos == INDEX_NOT_FOUND) {
      return str;
    }
    return str.substring(0, pos);
  }

  public static boolean isEmpty(String str) {
    return str == null || str.length() == 0;
  }
}

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