StringBuilderoffers also thedeleteCharAt()method. However, we will use here another method calleddelete()to remove the last char. Let’s illustrate the use of theStringBuilder.delete()method using a practical example: publicstaticString usingStringBuilderClass(String text) {if(text == null || text...
while (!deque.isEmpty() && deque.getLast() > temp && count[deque.getLast() - 'a'] > 0){ exists[deque.getLast() - 'a'] = false; deque.removeLast(); } deque.add(temp); exists[temp - 'a'] = true; } count[temp - 'a']--; } //返回 StringBuilder res = new StringBuilder...
StringBuilder sb = new StringBuilder(s.length()); boolean upperCase = false; for (int i = 0; i < s.length(); i++) { char c = s.charAt(i); if (c == SEPARATOR) { upperCase = true; } else if (upperCase) { sb.append(Character.toUpperCase(c)); upperCase = false; } else...
和String类不同的是,StringBuffer和StringBuilder类的对象能够被多次修改,长度可变并且不产生新的未使用对象 StringBuilder不是线程安全的(不能同步访问),但相较于StringBuffer有速度优势,多数情况下建议使用 publicclassTest{publicstaticvoidmain(Stringargs[]) {StringBuffersBuffer =newStringBuffer("Hello,"); sBuffer...
StringBuilder insert(int offset, String str) Inserts the string into this character sequence. int lastIndexOf(String str) Returns the index within this string of the rightmost occurrence of the specified substring. int lastIndexOf(String str, int fromIndex) Returns the index within this string...
set.remove(stack.removeLast()); } //当前元素入栈 set.add(c); stack.addLast(c); } //当前元素可用数量-1 map[c-'a']--; } StringBuilder sb=new StringBuilder(stack.size()); for(Character c:stack) sb.append(c.charValue());
In general, if sb refers to an instance of a StringBuilder, then sb.append(x) has the same effect as sb.insert(sb.length(), x). Every string builder has a capacity. As long as the length of the character sequence contained in the string builder does not exceed the capacity, it is ...
答:可以使用indexOf()方法或lastIndexOf()方法来获取字符串中指定字符的索引位置,例如:String str = "Hello"; int index = str.indexOf('o'); 29.问:如何将多个字符串拼接成一个字符串? 答:可以使用StringBuilder/StringBuffer的append()方法进行字符串拼接,例如:...
Deletes the character at the specified index. shifts any remaining characters to the left. C# 复制 [Android.Runtime.Register("deleteCharAt", "(I)Ljava/lang/StringBuilder;", "")] public Java.Lang.StringBuilder DeleteCharAt (int index); Parameters index Int32 the index of the character to ...
StringBuilder.IndexOf Method Reference Feedback Definition Namespace: Java.Lang Assembly: Mono.Android.dll Overloads 展开表 IndexOf(String, Int32) Searches for the index of the specified character. IndexOf(String) Searches for the first index of the specified character. ...