题目: Implement strStr(). Returns the index of the first occurrence of needle in haystack, or -1 if needle is not part of haystack. 题意: 实现strStr() 返回needle在haystack中第一次出现的位置,如果haystack中不存在needle,返回-1. 算法分析: 方法一: * in Java, there is an API function name
Depending on the usage, there are several "correct" answers. Since java5 the best way to do it is to use an enum: public enum Foo { INSTANCE; } The Right Way to Implement a Serializable Singleton public enum Elvis { INSTANCE; private final Strin
List, Map and Stack implementations in Java This article describes how to implement data structures (List Stack, Map) in Java. The implementations in this articles are for demonstration and education purpose. They do not try to be as efficient as the
List implementations in Java This article describes how to implement a list data structure in Java. The implementations in this articles are for demonstration and education purpose. They do not try to be as efficient as the standard libraries and the
Implement strStr(). Returns the index of the first occurrence of needle in haystack, or -1 if needle is not part of haystack. 解题思路: 直接看代码即可,JAVA实现如下: static public int strStr(String haystack, String needle) { for(int i=0;i<=haystack.length()-needle.l
Implement the following operations of a stack using queues. push(x) -- Push element x onto stack. pop() -- Removes the element on top of the stack. top() -- Get the top element. empty() -- Return whether the stack is empty. Notes: You must use only s
在java中extends用于继承父类,只要父类不是声明为final或者为abstract类就可以,但是java不支持多重继承.可以使用接口实现多重继承implements,继承只能继承一个类,但implements可以实现多个接口,用逗号分开就行了比如class A extends B implements C,D,E. java 关于extends 和implement的区别