StringBuffer类概述及其构造方法

public class StringBufferDemo {
    public static void main(String[] args) {

        //public StringBuffer();
        StringBuffer buffer1 = new StringBuffer();
        System.out.println("buffer1:"+buffer1);
        System.out.println("buffer1.capacity:"+buffer1.capacity());
        System.out.println("buffer1.length:"+buffer1.length());
        System.out.println("---------------------------------");
    }
}

buffer1:
buffer1.capacity:16
buffer1.length:0  //没有加入字符

/**
 * Constructs a string buffer with no characters in it and an
 * initial capacity of 16 characters.
 */
public StringBuffer() {
    super(16);
}