下面一些常用的常量的程序，请解释带编号的语句。

public  class  SomeConstTest{

  public  static  void  main(String  args[]){

   //1

  System.out.println("Byte.MAX_VALUE ="+ Byte.MAX_VALUE);

       System.out.println("Byte.MIN_VALUE ="+ Byte.MIN_VALUE);

       System.out.println();

 //输出int型的最大值与最小值

    System.out.println("Integer.MAX_VALUE ="+ Integer.MAX_VALUE);

      System.out.println("Integer.MIN_VALUE ="+ Integer.MIN_VALUE);

      System.out.println();

      //2

    System.out.println("Long.MAX_VALUE ="+ Long.MAX_VALUE);

     System.out.println("Long.MIN_VALUE ="+Long.MIN_VALUE);

     System.out.println();

//3

    System.out.println("Float.MAX_VALUE ="+ Float.MAX_VALUE);

      System.out.println("Float.MIN_VALUE ="+ Float.MIN_VALUE);

      System.out.println();

    //4

    System.out.println("Double.MAX_VALUE ="+ Double.MAX_VALUE);

     System.out.println("Double.MIN_VALUE ="+ Double.MIN_VALUE);

     System.out.println();

//5

        System.out.println("Float.POSITIVE_INFINITY ="+ Float.POSITIVE_INFINITY);

        System.out.println("Float.NEGATIVE_INFINITY ="+ Float.NEGATIVE_INFINITY);

        System.out.println();

 //输出double型的正无穷大与负无穷大

        System.out.println("Double.POSITIVE_INFINITY ="+ Double.POSITIVE_INFINITY);

        System.out.println("Double.NEGATIVE_INFINITY ="+ Double.NEGATIVE_INFINITY);

        System.out.println();

         //输出float型0/0

        System.out.println("Float.NaN ="+ Float.NaN);

        System.out.println();

        //输出double型0/0

    System.out.println("Double.NaN ="+ Double.NaN);

    System.out.println();

}