StringBuffer的常用方法

package String.StringBuffer01;

/**
 * @author jee
 * @version 1.0
 */
//  StringBuffer类的常用方法
//    1.增加 append()
//    2.删除 delete()
//    3.修改 replace()
//    4.查找 indexOf()
//    5.插入 insert()
//    6.获取长度 length()
public class StringBuffer02 {
    public static void main(String[] args) {
        StringBuffer stringBuffer = new StringBuffer("hello");
        stringBuffer.append(',');
        stringBuffer.append("world");
        stringBuffer.append("my heart will go on");
        System.out.println(stringBuffer);

        stringBuffer.delete(5,7);
        System.out.println(stringBuffer);

        stringBuffer.replace(5,7,"45");
        System.out.println(stringBuffer);

        int l = stringBuffer.indexOf("l");
        System.out.println(l);

        stringBuffer.insert(9,"world");//在索引为9的位置插入world,原来在索引为9的字符往后移动

        System.out.println(stringBuffer.length());

    }
}