Java需要帮助来理解代码 [英] Java need help to understand the code

问题描述

公共课考试{

int i;

int j;



public static void main（String [] args）{



测试t1 =新测试（）;

测试t2 =新测试（）;



t1.j = t2.i = 5;

t1.i = t2.j = 6;



System.out.print（t1.j ++ ++ t2.i--）;



}

}

解决方案

因为x ++是所谓的后缀运算符：它意味着获取x的值然后增加x一个但不影响你之前提取的值：

  int  temp = x; 
 x = x +  1 ; 
  return  temp; 

参见 https://docs.oracle.com/javase/tutorial/java/index.html [ ^ ]，并通过它完成所有答案。

public class Test {
int i;
int j;

public static void main(String[] args) {

Test t1 = new Test();
Test t2 = new Test();

t1.j=t2.i=5;
t1.i=t2.j=6;

System.out.print(t1.j++ + " " + t2.i--);

}
}

解决方案

Because x++ is what's called a "postfix" operator: it means "get the value of x and then increase x by one but do not affect the value you fetched earlier":

int temp = x;
x = x + 1;
return temp;

See https://docs.oracle.com/javase/tutorial/java/index.html[^], and work through it, all the answers can be found there.

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