StringUtils-leftPad、rightPad、center填充方法

素颜马尾好姑娘i 2022-02-03 01:39 413阅读 0赞

package com.qh.health.service;
    
    import org.apache.commons.lang3.StringUtils;
    
    /**
     * @author wzx
     * @since 2019-04-29
     */
    public class StringTest {
        public static void main(String[] args) {
            System.out.println("左填充");
            System.out.println(StringUtils.leftPad(null, 1, "*"));
            System.out.println(StringUtils.leftPad("", 3, 'z'));
            System.out.println(StringUtils.leftPad("bat", 3, 'z'));
            System.out.println(StringUtils.leftPad("bat", 5, 'z'));
            System.out.println(StringUtils.leftPad("bat", 1, 'z'));
            System.out.println(StringUtils.leftPad("bat", -1, 'z'));
    
            System.out.println("右填充");
            System.out.println(StringUtils.rightPad(null, 2, "*"));
            System.out.println(StringUtils.rightPad("", 3, "z"));
            System.out.println(StringUtils.rightPad("bat", 3, "yz"));
            System.out.println(StringUtils.rightPad("bat", 5, "yz"));
            System.out.println(StringUtils.rightPad("bat", 8, "yz"));
            System.out.println(StringUtils.rightPad("bat", 1, "yz"));
    
            //中间填充
            System.out.println("中间填充");
            System.out.println(StringUtils.center(null, 3, "*"));
            System.out.println(StringUtils.center("", 4, " "));
            System.out.println(StringUtils.center("ab", -1, " "));
            System.out.println(StringUtils.center("ab", 4, " "));
            System.out.println(StringUtils.center("abcd", 2, " "));
            System.out.println(StringUtils.center("a", 4, " "));
            System.out.println(StringUtils.center("a", 4, "yz"));
            System.out.println(StringUtils.center("abc", 7, null));
            System.out.println(StringUtils.center("abc", 7, ""));
        }
    }

输出结果

左填充
    null
    zzz
    bat
    zzbat
    bat
    bat
    右填充
    null
    zzz
    bat
    batyz
    batyzyzy
    bat
    中间填充
    null
        
    ab
     ab 
    abcd
     a  
    yayz
      abc  
      abc