题目内容
以下程序启动了十个线程，其中五个进程负责对变量x加1，另外五个进程负责对变量x减1，且进程之间互不干扰。public class Demo{private int x=0;public static void main(String[] args) {Demo demo=new Demo ();Add add = ____ (1)___;Sub sub = ____ (2)____;for(int i=1;____ (3)_____;i++){new Thread(add,"加线程"+i).start();new Thread(sub,"减线程"+i).start();}}class Add implements Runnable{public void run() {for(int i=0;i<10;i++){ operateX(0); }}}class Sub implements Runnable{public void run() {for(int i=0;i<10;i++){ operateX(1);}}}public ___ (4)____ void operateX (int n) {if(____ (5)___) x++; else x--;}}
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以下代码运用泛型实现了数组的倒排。请给出缺失的代码，使程序能正确执行。class ArrayUtils {public void reverse(T[] arr) { //倒排数组for (int i = 0; i < ___(1)___; i++) {____(2)___ = arr[i];arr[i] = arr[arr.length - 1 - i];arr[arr.length - 1 - i] = tem;}}}public class TestRawTypeClass {public static void main(String[] args) {ArrayUtils au1 = ___(3)____;Integer[] arr1 = new Integer[] { 1, 2, 3, 4, 5 };System.out.println("原数组："+Arrays.toString(arr1));au1.reverse(arr1); //倒排数组System.out.println("反转后："+Arrays.toString(arr1));
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Listen to thetransmission or short exchangeand choose the correct answer.
Listen to thetransmission or short exchangeand choose the correct answer.
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