Java 8 Stream Match sample. Using anyMatch, allMatch and noneMatch

StreamMatchSample.java

    //there is at least one negative number
    public void anyMatch(){
      boolean anyMatch;

      anyMatch = IntStream.of(-1,2,3,5,7,9)
                          .anyMatch(i -> i < 0);
      System.out.format("It is [%b] that at least one negative number \n", 
          anyMatch);
      //Output: It is [true] that at least one negative number 

      anyMatch = IntStream.of(2,3,5,7,9)
                          .anyMatch(i -> i < 0);
      System.out.format("It is [%b] that at least one negative number \n", 
          anyMatch);
      //Output: It is [false] that at least one negative number		
    }

    //all numbers are positive
    public void allMatch(){
      boolean allMatch;

      allMatch = IntStream.of(1, 4, 10, 3, 9)
                      .allMatch(i -> i >= 0);
      System.out.format("It is [%b] that all numbers are postive \n", 
          allMatch);
      //Output: It is [true] that all numbers are positive

      allMatch = IntStream.of(1, 4, 10, -3, 3, 9)
                            .allMatch(i -> i >= 0);
      System.out.format("It is [%b] that all numbers are postive \n", 
          allMatch);
      //Output: It is [false] that all numbers are positive

      //but we can use a negation here, using none match
      allMatch = IntStream.of(1, 4, 10, 3, 9)
                  .noneMatch(i -> i < 0);
      System.out.format("It is [%b] that all numbers are postive \n", 
          allMatch);
      //Output: It is [true] that all numbers are positive

    }

    //all numbers are negative
    public void noneMatch(){
      boolean noneMatch;

      noneMatch = IntStream.of(1, 4, 10, 3, 9, -1, -10)
                      .noneMatch(i -> i >= 0);
      System.out.format("It is [%b] that all numbers are negative \n", 
          noneMatch);
      //Output: It is [false] that all numbers are negative

      noneMatch = IntStream.of(-1, -4, -10, -3, -3, -9)
                            .noneMatch(i -> i >= 0);
      System.out.format("It is [%b] that all numbers are negative \n", 
          noneMatch);
      //Output: It is [true] that all numbers are negative
    }