判断变量是否为root if(!"${User}".equals("root")){ Failure=true; FailureMessage="ERROR,The user is not root!"; } else{ Failure=false; FailureMessage="Success,The user is root!"; }
列表(list) list中添加,获取,删除元素 添加方法是:.add(e): 获取方法是:.get(index): 删除方法是:.remove(index), 按照索引删除: .remove(Object o): 按照元素内容删除: import java.util.*; public class one { public static void main(String[] args) { List<String> person=new ArrayList<>(); person
代码实现: package com.qiusongde; import edu.princeton.cs.algs4.In; import edu.princeton.cs.algs4.StdOut; public class InsertionWithSentinel { public static void sort(Comparable[] a) { int N = a.length; for(int i = N - 1; i > 0; i--) { if(less(a[i], a[i-1