list 工具

Posted 2020-08-10 smallstrange

import org.apache.commons.lang.StringUtils;

import java.util.ArrayList;
import java.util.Arrays;
import java.util.Collections;
import java.util.List;

/**
 * @Description list 工具
 * @version 1.0.0
 **/
public class ArrayUtil {

    /**
     * @Description 将数组转换成字符串
     * 格式:begin+prefix+str0+suffix+split+prefix+str1+suffix...+end
     * 为空会跳过
     * @param str 被转换的数组
     * @param split 分隔符
     * @param prefix 前缀
     * @param suffix 后缀
     * @param begin 开始
     * @param end 结束
     * @return string
     */
    public static String toString(List<String> str,String split, String prefix, String suffix, String begin, String end){
        StringBuffer string = new StringBuffer();
        string.append(begin);
        for(int i = 0;i < str.size();i++){
            String s = str.get(i);
            if(StringUtils.isBlank(s)){
                continue;
            }
            string.append(prefix);
            string.append(s);
            string.append(suffix);
            if(i < (str.size() - 1)){
                string.append(split);
            }
        }
        string.append(end);
        return string.toString();
    }

    public static String toString(List<String> str, String split, String prefix, String suffix){
        return toString(str,split,prefix,suffix,"","");
    }

    public static String toString(List<String> str, String split){
        return toString(str,split,"","","","");
    }

    public static String toString(String[] str,String split, String prefix, String suffix, String begin, String end){
        List<String> list = Collections.EMPTY_LIST;
        if(str != null && str.length > 0){
            list = Arrays.asList(str);
        }
        return toString(list,split,prefix,suffix,begin,end);
    }

    public static String toString(String[] str, String split, String prefix, String suffix){
        List<String> list = Collections.EMPTY_LIST;
        if(str != null && str.length > 0){
            list = Arrays.asList(str);
        }
        return toString(list,split,prefix,suffix);
    }

    public static String toString(String[] str, String split){
        List<String> list = Collections.EMPTY_LIST;
        if(str != null && str.length > 0){
            list = Arrays.asList(str);
        }
        return toString(list,split);
    }

    /**
     * @Description 去除重复
     * @param list 集合
     * @return List
     */
    public static <T> List<T> removeRepeat(List<T> list){
        List<T> result = new ArrayList<>();
        for(T data : list){
            if(!result.contains(data)){
                result.add(data);
            }
        }
        return result;
    }

    /**
     * @Description 数组转in SQL String 例 : ‘1‘,‘2‘
     * @param arr 数组
     * @return
     */
    public static String arrToStringSql(String arr[]){
        StringBuffer stringSql = new StringBuffer();
        for(int i = 0; i < arr.length; i++){
            if(i == 0){
                stringSql.append("‘");
                stringSql.append(arr[i]);
                stringSql.append("‘");
            }else {
                stringSql.append(",‘");
                stringSql.append(arr[i]);
                stringSql.append("‘");
            }
        }
        return stringSql.toString();
    }
}