1, StringBuffer delete function
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public StringBuffer deleteCharAt(int index):
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Delete the character at the specified position and returns itself
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public StringBuffer delete(int start,int end):
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Remove content from the specified location to start the specified end position and returns itself
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public class Demo3_StringBuffer {
/**
* * A:StringBuffer的删除功能
* public StringBuffer deleteCharAt(int index):
* 删除指定位置的字符，并返回本身
* public StringBuffer delete(int start,int end):
* 删除从指定位置开始指定位置结束的内容，并返回本身
*/
public static void main(String[] args) {
StringBuffer sb = new StringBuffer();
//sb.deleteCharAt(5); //当缓冲区中这个索引上没有元素的时候就会报StringIndexOutOfBoundsException
sb.append("heima");
//sb.deleteCharAt(4); //根据索引删除掉索引位置上对应的字符
//sb.delete(0, 2); //删除的时候是包含头,不包含尾
//System.out.println(sb);
//sb.delete(0, sb.length()); //清空缓冲区
//System.out.println(sb);
sb = new StringBuffer(); //不要用这种方式清空缓冲区,原来的会变成垃圾,浪费内存
System.out.println(sb);
}
}