清空有3种方法: 1)新生成一个,旧的由系统自己主动回收 2)使用delete 3)使用setLength 将三种方法循环1000万次,代码: 1.public class sbbm { 2. 3. static String a; 4. static long time ; 5. public static void main( String[] args ) throws Exception { 6. 7. StringBuilder sb = new StringBu...
在offset处插入c,其他的依次后移(也可以插入其他类型数据,不过都原样转化为了字符串) 4.delete(int startIndex,int endIndex) 将从startIndex到endIndex-1的字符删除 四.键盘输入 next()和nextLine() Scanner in=new Scanner(system.in); String str=in.next(); String str=in.nextLine(); 1. 2. 3. 4...
Sign in C# Add to Collections Add to Plan Print TwitterLinkedInFacebookEmail Reference Feedback Definition Namespace: Java.Lang Assembly: Mono.Android.dll Deletes a sequence of characters specified bystartandend. C# [Android.Runtime.Register("delete","(II)Ljava/lang/StringBuilder;","")]publicJa...
delete public StringBuilder delete(int start, int end) Removes the characters in a substring of this sequence. The substring begins at the specified start and extends to the character at index end - 1 or to the end of the sequence if no such character exists. If start is equal to end, ...
2.5 delete方法 /** * @throws StringIndexOutOfBoundsException {@inheritDoc} */ @Override public StringBuilder delete(int start, int end) { super.delete(start, end); return this; } /** * Removes the characters in a substring of this sequence. ...
StringBuffer delete(int start,int end):删除指定位置的内容 StringBuffer replace(int start, int end, String str):把[start,end)位置替换为str StringBuffer insert(int offset, xxx):在指定位置插入xxx StringBuffer reverse() :把当前字符序列逆转 ...
StringBuilderStringBuilder.delete(int start, int end) StringBuilderStringBuilder.deleteCharAt(int index) StringBuilderStringBuilder.insert(int offset, boolean b) StringBuilderStringBuilder.insert(int offset, char c) StringBuilderStringBuilder.insert(int offset, char[] str) ...
StringBuilder不一致的删除方法 java methods stringbuilder StringBuilder builder = new StringBuilder(); builder.append("hello"); builder的长度是5。所以,如果我打电话给builder.deleteCharAt(5),我会得到一个IndexOutOfBoundsException,但我可以打电话给builder.delete(0,5),这是成功的。我能知道为什么吗?
三、Delete删除操作的实现 @Override public StringBuilder deleteCharAt(int index) { super.deleteCharAt(index);//调用父类的方法 return this;//返回当前对象 } public AbstractStringBuilder deleteCharAt(int index) { if ((index < 0) || (index >= count)) ...
同时 delete 操作的方式略微优于 setLength 的方式,推荐使用 delete 的方式。 小结 通过 IDE 的一个提示信息,我们进行底层原理深挖及实现的验证,竟然发现这么多可提升的空间和隐藏知识点,是不是很有成就感?最后,我们再来稍微总结一下 String 和 StringBuilder 涉及到的知识点(基于 Java8 及以上版本): 没有循环...