java-StringBuffer构造方法
package com.day8.StringBuffer;
public class Dome1StringBuffer {
/**
* 一.StringBuffer的构造方法:
* 1.public StringBuffer():无参构造方法
* 2.public StringBuffer(int capacity):指定容量的字符串缓冲区对象
* 3.public StringBuffer(String str):指定字符串内容的字符串缓冲区对象
* 二.StringBuffer的方法
* 1.public int capacity():返回当前容量,理论值
* 2.public int length():返回长度(字符数),实际值
*/
public static void main(String[] args) {
StringBuffer sb=new StringBuffer();
System.out.println(sb.length());//容器中的字符个数,输出0
System.out.println(sb.capacity());//输出16,理论值初始容器长度为16
StringBuffer sb2=new StringBuffer(10);
System.out.println(sb2.length());//实际长度还是0
System.out.println(sb2.capacity());//输出10,因为指定长度为10
StringBuffer sb3=new StringBuffer("KobeBryant");
System.out.println(sb3.length());//10
System.out.println(sb3.capacity());//26=16+10
}
}