Java 源码 StringBuilder 类

介绍

A mutable sequence of characters. This class provides an API compatible with StringBuffer, but with no guarantee of synchronization.

示例

public class Test {
  public static void main(String[] args) {
    StringBuilder sb = new StringBuilder();
    sb.append("费哥");
    sb.append("爱你");
    System.out.println(sb.toString());
  }
}

结构

源码

成员变量

/**
 * The value is used for character storage.
 */
char[] value;

构造方法

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

成员方法

/**
 * Appends the specified string to this character sequence.
 */
public StringBuilder append(String str) {
  super.append(str);
  return this;
}