java代码如何清空StringBuilder对象中的值呢?

清空StringBuilder对象中值的实现思路

方式1:
   使用stringBuilder.setLength(0)方法
方式2：
   使用new StringBuilder重新为StringBuilder赋值

package com.java265.other;

public class Test21 {
	/**
	 * java265.com StringBuilder清空的示例
	 */
	public static void main(String[] args) {
		StringBuilder obj = new StringBuilder();
		obj.append("a");

		System.out.println(obj.length());
		obj.setLength(0);
		System.out.println(obj.length());

		obj.append("a");

		System.out.println(obj.length());
		obj = new StringBuilder();
		System.out.println(obj.length());

	}
}