StringBuilder常用操作 - 黑马程序员技术交流社区

import java.util.Arrays;
public class StringBuilderDemo {
public static void main(String[] args) {
//创建StringBuilder对象
StringBuilder stringBuilder = new StringBuilder();
//将指定数据添加到已有数据的末尾
stringBuilder.append("This ");
stringBuilder.append(" a StringBuilder type.");
//将指定数据添加到指定的位置
stringBuilder.insert(5, "is");
//将数据转换为String
System.out.println(stringBuilder.toString());
//将[start， end)数据删除。删除"this"
stringBuilder.delete(0, 4);
//删除指定索引的字符
stringBuilder.deleteCharAt(0);
System.out.println(stringBuilder.toString());
//获取指定索引0的字符
System.out.println(stringBuilder.charAt(0));
//获取指定字符串"Stri"的第一个索引
System.out.println(stringBuilder.indexOf("Stri"));
//获取指定字符串"e"的最后一个索引
System.out.println(stringBuilder.lastIndexOf("e"));
//返回指定区间的字符串
System.out.println(stringBuilder.substring(0, 3));
//将指定区间的数据替换
System.out.println(stringBuilder.replace(0, 3, "KKKKKKKKKKK"));
//设定指定索引的字符
stringBuilder.setCharAt(0, 'J');
System.out.println(stringBuilder.toString());
//反转
System.out.println("reversed: " + stringBuilder.reverse().toString());
System.out.println("original: " + stringBuilder.toString());
//将缓冲区指定区间的数据填充到数组中
char[] chars = new char[100];
for (int i = 0; i < chars.length; i++) {
chars[i] = ' ';
}
stringBuilder.getChars(0, stringBuilder.length() - 1, chars, 2);
System.out.println(chars);
}
}

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