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StringJoiner是Java里1.8新增的类,主要是帮助我们把一个列表拼接字符串， 或许有一部分人没有接触过. 所以本文将从使用例子入手, 分析StringJoiner的源码.

基本好的同学, 其实只要把这段例子自己运行一下, 自己看看源码就可以了.因为我觉得这个类挺简单的. 没必要看我下面的废话....

public class StringJoinerTest {
 public static void main(String[] args) {
 StringJoiner joiner = new StringJoiner("--", "[[[_", "_]]]");
 System.out.println("toString: " + joiner.toString());
 System.out.println("length: " + joiner.length());
 
 System.out.println("******************(1)********************");
 
 joiner.add("1");
 joiner.add("2");
 joiner.add("3");
 joiner.add("4");
 System.out.println("toString: " + joiner.toString());
 System.out.println("length: " + joiner.length());
 
 System.out.println("******************(2)********************");
 
 StringJoiner joiner2 = new StringJoiner("...");
 System.out.println("toString: " + joiner2.toString());
 System.out.println("length: " + joiner2.length());
 
 System.out.println("******************(3)********************");
 
 joiner2.add("a");
 joiner2.add("b");
 joiner2.add("c");
 System.out.println("toString: " + joiner2.toString());
 System.out.println("length: " + joiner2.length());
 
 System.out.println("******************(4)********************");
 
 joiner.merge(joiner2);
 System.out.println("toString: " + joiner.toString());
 
 System.out.println("******************(5)********************");
 
 StringJoiner joiner3 = new StringJoiner("==", "qianzhui", "houzhui");
 joiner3.add("壹");
 joiner3.add("贰");
 joiner3.add("叁");
 
 joiner.merge(joiner3);
 System.out.println("toString: " + joiner.toString());
 System.out.println("length: " + joiner.length());
 
 System.out.println("******************(6)********************");
 joiner.merge(joiner); // joiner.merge(this)
 System.out.println("toString: " + joiner.toString());
 System.out.println("length: " + joiner.length());
 }
}

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