quiz4_7.java

北京大学出版社的

public class Quiz4_7 {
   private int value;
   public Quiz4_7( int input ) {
      value = input;
   }
   public String toString() {
      return String.valueOf( value );
   }
   public static void main ( String[] args ) {
      Quiz4_7 a = new Quiz4_7();
      Quiz4_7 b = new Quiz4_7( 42 );
      System.out.println( a );
      System.out.println( b );
   }
}