java basics for hadoop

Java BASICS (2) and java Basics 1. absolute path/relative path 1> complete absolute path URL 2> the relative path/starting with "/" indicates the entire web project. 3> relative paths not starting with "/"./indicates the current path./indicates the upper path. Two-thread status New ready for execution blocking death Al

[Java Basics] 14. bitwise operations-bitwise AND () operations-(fast modulo algorithm) and java Basics 14 Operations The redis dictionary structure is learned. The hash Value sizemask operation is used when the hash is used to find the index value of the slot,The subsequent scan operations involve the scanning sequenc

Java concurrency BASICS (I) -- Thread, java concurrency basics thread Concurrent Programming allows us to divide programs into multiple separate and independent tasks. With the multi-thread mechanism, these independent tasks will be driven by the execution thread. When a thread is used, the CPU will take turns to alloc

Java basics-I/O (2), java basics I/O Next, take the study notes. I/O learning, I suddenly found some advantages, as if to operate the computer in the future, especially the files in the computer, you can rarely use the mouse. You can add, modify, or delete a few lines of code. This is just a little bit of my mind for b

Java basics 12: java Basics Public class Twelfth {/* There are a bunch of peaches on the beach, and five monkeys can score points. The first monkey divided the pile of peach creden into five portions, one more. The monkey threw the other one into the sea and took one. The second monkey divides the remaining peaches

Java basics-Bubble sorting, java basics bubble // Bubble sort, and compare public static void sort1 (int [] aa) {int size = aa from the back of the array. length; int temp; // cyclic array for (int I = 0; I Sort idea: the first layer for loop, each value in the loop array, the second layer for loop, compare the size

Java BASICS (19) IO streams (2), java basics io streams Here are some of the knowledge points and code I summarized in my previous class. Most of the notes I think are very good and classic, sincerely hope that these will help those who want to learn! It is inconvenient to upload code by module. There are also many thi

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JAVA binary basics and java binary BasicsMain Content 1. Decimal Binary Conversion 2. bitwise operation of Binary 3. JDK built-in hexadecimal conversion 4. hexadecimal in JAVADecimal Binary Conversion 57 111001 Binary bit operations: advantages: it is easy to compute and widely supported in certain situations. ① Bitwise AND (two full bits 1, the result is 1)

Java BASICS (6): java BasicsI. Packaging JAVA is an object-oriented language. java classes connect methods with data,Basic type objects cannot be defined in JAVA,To treat basic types as objects for processing,

Java Basics !!!, Java BasicsQuestion 1: What are the results of 0.01 + 0.09? public class MathTest{ public static void main(String[]args){ double a = 0.01, b = 0.09; System.out.print(a+b); }} Why is the printed result 0.09999999999999999 instead of 0.1, and the loss of precision occurs? Both double and float will encounter this problem. Let's talk about float. Th

The client needs to specify the NS name, node configuration, Configuredfailoverproxyprovider and other information.code example:Package Cn.itacst.hadoop.hdfs;import Java.io.fileinputstream;import java.io.inputstream;import Java.io.outputstream;import Java.net.uri;import Org.apache.hadoop.conf.configuration;import Org.apache.hadoop.fs.filesystem;import Org.apache.hadoop.fs.path;import org.apache.hadoop.io.IOUtils; Public classHdfs_ha { Public Static voidMain (string[] args) throws Exception {Conf