multiply.java

Java 入门书的源码

//Copyright (c) 1998, Arthur Gittleman
//This example is provided WITHOUT ANY WARRANTY either expressed or implied.

/*  Define a multiplyBy4 method and use it in a program */

public class Multiply {
  public static int multiplyBy4(int aNumber) {
    return 4*aNumber;
  }
  public static void main(String [ ] args) {
    int x=7, y=20, z=-3, result;
    result = multiplyBy4(x);
    System.out.println("The result is " + result);
    result = multiplyBy4(y+2);
    System.out.println("The result is " + result);                      
    result = 5 + multiplyBy4(z);
    System.out.println("The result is " + result);
    result = multiplyBy4(31);
    System.out.println("The result is " + result);					
    System.out.println("The result is " + multiplyBy4(y));  
  }
}