Programmer Think

1, One way circular list 1. One way circular list details In fact, a unidirectional circular list is a pointer to the head node of the end node. Generally, the end node of the list points to null. When adding a node, the tail situation is the same as the normal situation, and no special processing i ...

Title Description Xiaoyi came to a stone road, each stone from 1 next to the number: 1, 2, 3 This flagstone road can only advance according to special rules: for the flagstone whose number is k, Xiaoyi can only jump forward one divisor step of K (excluding 1 and K) at a time, that is, jump to the posi ...

Runtime type information allows you to discover and use type information while the program is running. In Java, there are two main ways for us to recognize the information of objects and classes at run time: the first is "traditional" RTTI, which assumes that we have known all types at compile ...

Let's talk about the last step of preparing to upgrade presto, because the pre deployed Presto machine itself deployed a CDH cluster (customer's home), and the machine was Centos6.x. according to the JDK on the Cloudrea official website, it can't move. Later, it was found that his JDK environment variab ...

Which of the following methods is used to define the thread's execution body (): run() ==The memory address is judged. integer can call cache directly when it gives int value between - 127 and 128, so if the memory address is the same, an object will be new if it exceeds this range, and false will be re ...

Preface Recently, because of the company's needs, we need to understand the java probe, find information on the Internet, and find a lot of data, but there are too few examples. Some of them paste the company code directly, which is too complex, and some of them are particularly simple, which is not what I want. I want an example like this: The ...

1 what is controlling concurrent processes? The tool class that controls concurrent processes is used to help our programmers make it easier for threads to cooperate Let threads cooperate with each other to meet business logic For example, let thread A wait for thread B to finish executing befor ...

First, introduce the sigar package implementation 'org.fusesource:sigar:1.6.4' Secondly, Under windows environment, put the three files of sign-amd64-winnt.dll, sign-x86-winnt.dll and sign-x86-winnt.lib in the bin directory of jdk Or configuration under Windows: select sign-amd64-winnt.dll or ...

First, write a simple class, which contains a native method public class JNI{ static{ // Load the dynamic link library, which we will create below System.loadLibrary("hello_jni"); } public native void hello(); public static void main(String[] args){ JNI jni = new JNI(); jni.hello(); } } ...

  1. Biased lock: the biased lock mode is used to bias the lock to a given lock thread. When this mode is set to the lower three bits, the lock may be biased toward a particular thread or "anonymous", indicating that it may be biased. When a lock is biased toward a given thread, locking an ...