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Copying a HashMap in Java
...ashmap
Program for copy all elements from one hashmap to another
import java.util.HashMap;
public class CloneHashMap {
public static void main(String a[]) {
HashMap hashMap = new HashMap();
HashMap hashMap1 = new HashMap();
hashMap.put(1, "One");
...
Java equivalent of unsigned long long?
...unsigned integer, via unsigned long long int , or via uint64_t . Now, in Java longs are 64 bits, I know. However, they are signed.
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JAVA线程池管理及分布式HADOOP调度框架搭建 - 人工智能(AI) - 清泛IT社区，...
...变成多线程程序呢？不同的语言有不同的实现，这里说下java语言的实现多线程的两种方式：扩展java.lang.Thread类、实现java.lang.Runnable接口。
先看个例子，假设有100个数据需要分发并且计算。看下单线程的处理速度：package thread;
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Importing two classes with same name. How to handle?
...n omit the import statements and refer to them using the entire path. Eg:
java.util.Date javaDate = new java.util.Date()
my.own.Date myDate = new my.own.Date();
But I would say that using two classes with the same name and a similiar function is usually not the best idea unless you can make it re...
What does a just-in-time (JIT) compiler do?
...guage but yes, purely interpreted code (without any JITting) is slow. Even Java bytecode without a JITter is really slow.
– Mark Cidade
Sep 18 '08 at 22:07
49
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Why can't I define a static method in a Java interface?
EDIT: As of Java 8, static methods are now allowed in interfaces.
24 Answers
24
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How to get current working directory in Java?
...s were initialized". This is probably what you want. to find out where the java command was issued, in your case in the directory with the files to process, even though the actual .jar file might reside somewhere else on the machine. Having the directory of the actual .jar file isn't that useful in ...
What is the difference between dynamic and static polymorphism in Java?
...hat explains the difference between Dynamic and Static polymorphism in Java?
14 Answers
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How to create a sub array from another array in Java?
...use
JDK > 1.5
Arrays.copyOfRange(Object[] src, int from, int to)
Javadoc
JDK <= 1.5
System.arraycopy(Object[] src, int srcStartIndex, Object[] dest, int dstStartIndex, int lengthOfCopiedIndices);
Javadoc
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Recursively list files in Java
How do I recursively list all files under a directory in Java? Does the framework provide any utility?
26 Answers
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