testunary.java

java程序设计 清华出版社 孙燮华老师编写的程序源代码

//TestUnary.java 
public class TestUnary{
  public static void main(String args[]){    
    int i = 0;
    System.out.println("i = 0; (i++) = " + (i++));//先输出i，再将i加1
                                                  //所以结果(i++) = 0
    System.out.println("i = " + i);               //i=1
    i = 0;
    System.out.println("i = 0; (++i) = " + (++i));//先将i加1，再输出i=1
    
    int j = 0;
    System.out.println("j = 0; (j--) = " + (j--));//先输出j，再将j减1
                                                  //所以结果(j--) = 0
    System.out.println("j = " + j);               //j=-1
    j = 0;
    System.out.println("j = 0; (--j) = " + (--j));//先将i加1，再输出j=-1
    
    int x = 4, y = 8;
    System.out.println("x = 4; y = 8; x(x++)*(--y) = " + (x++)*(--y));    
  }
}