自定义StringBuilder类拼接非空字符串

主要目的: 为了拼接多个非空字符串,还能达到链式的装X效果这里不考虑线程安全,所以使用StringBuilder快速拼接非空内容,中间用","作为分隔。

代码如下:

package com.baidu;import org.apache.commons.lang.StringUtils;import org.junit.Test;

public class MyStringBuilder {    private StringBuilder sb;    private Thread thread;    public MyStringBuilder() {        this.thread = Thread.currentThread ();        //判断放在放在构造函数中        if (sb == null) {            sb = new StringBuilder ();        }    }

public StringBuilder getSb() {        return sb;    }

public MyStringBuilder setSb(StringBuilder sb) {        this.sb = sb;        return this;    }

//item为空不拼接    public MyStringBuilder append(String item) {        if (this.thread != Thread.currentThread ()) {            throw new RuntimeException ("不能在多线程中使用");        }

if (StringUtils.isNotBlank (item)) {            if (sb.length () > 0) {                sb.append (",");            }            sb.append (item);        }        return this;    }

//不暴漏get方法,直接用类实例toString()    public String toString() {        //清空缓存并返回sb里的数据        String var1 = sb.toString ();        sb.delete (0, sb.length ());        return var1;    }

@Test    public void test() {        MyStringBuilder mySb = new MyStringBuilder ();        mySb.append ("aaa").append ("bbb").append ("ccc");        System.out.println ("mySb :" + mySb.toString ());

MyStringBuilder mySb2 = new MyStringBuilder ();        mySb2.append ("aaa2")                .append ("bbb2")                .append ("ccc2");        System.out.println ("mySb2 :" + mySb2.toString ());

//测试不能再多线程使用异常        new Thread (() -> {            mySb.append ("rr");        }).start ();    }}

原文地址：https://www.cnblogs.com/coloz/p/10288999.html