Java - `Writer`到`String`的转换

原文： https://beginnersbook.com/2015/05/java-writer-to-string-conversion/

package com.beginnersbook.string;
import java.io.StringWriter;
public class WriterToString {
    public static void main(String args[]){
        // create a new writer
          StringWriter sw = new StringWriter();
          // append a char       
          sw.append("abc");
          sw.append(" xyz");
          String str = sw.toString();
          System.out.println(str);
    }
}

输出：

abc xyz