看看这个函数的有关问题_J2SE

看看这个函数的问题

Java code

public static String deleSubSet() {        char[] parent = {'0','1','2','3','4','5','6','7','8','9'};            Arrays.sort(parent);                char[] subSet = {'6','3','4',};                Arrays.sort(subSet);        StringBuffer sb = new StringBuffer();        for (int i = 0, k = 0; i < parent.length; i++) {            if (parent[i] == subSet[k]) {                k++;                            } else {                sb.append(parent[i]);            }        }        return sb.toString();    }

作用：将parent中，包含subSet的元素删除，然后返回被删除后的parent

看这个代码有什么问题。

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Java code

for (int i = 0, k = 0; i < parent.length; i++) {            if (k<subSet.length && i<parent.length && parent[i] == subSet[k]) {                k++;            } else {                sb.append(parent[i]);            }        }
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你的问题在于会把k值增加到大于subSet的范围，引发异常，1楼加上了判断处理，就避免了这个问题，不过1楼if里的i<parent.length这个就没有必要了。
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Java codeimport java.util.*;public class Del{    public static void main(String[] args) {                char[] parent = {'0','1','2','3','4','5','6','7','8','9'};            Arrays.sort(parent);                char[] subSet = {'6','3','4',};                Arrays.sort(subSet);        StringBuffer sb = new StringBuffer();        for (int i = 0, k = 0; i < parent.length; i++) {            if (k<subSet.length && parent[i] == subSet[k]) {                k++;                            } else {                sb.append(parent[i]);            }        }        System.out.println(sb);        //return sb.toString();    }}
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用API更简单
Java code    public static String deleSubSet() {        Character[] parent = {'0','1','2','3','4','5','6','7','8','9'};               Character[] subSet = {'6','3','4',};        ArrayList<Character> pArrayList = new ArrayList<Character>();        ArrayList<Character> sArrayList = new ArrayList<Character>();        pArrayList.addAll(Arrays.asList(parent));        sArrayList.addAll(Arrays.asList(subSet));        pArrayList.removeAll(sArrayList);        return pArrayList.toString();    }
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Java code

import java.util.*;

public class Del
{
    public static void main(String[] args) {
        
        char[] parent = {'0','1','2','3','4','5','6','7','8','9'};
    
        Arrays.sort(p……