OnJava8-Examples/strings/IntegerMatch.java

//: strings/IntegerMatch.java
// <20>2015 MindView LLC: see Copyright.txt

public class IntegerMatch {
  public static void main(String[] args) {
    System.out.println("-1234".matches("-?\\d+"));
    System.out.println("5678".matches("-?\\d+"));
    System.out.println("+911".matches("-?\\d+"));
    System.out.println("+911".matches("(-|\\+)?\\d+"));
  }
} /* Output:
true
true
false
true
*///:~