Original web site: http://algs4.cs.princeton.edu/linux/ Part. I [username:~/] [username:~/] mkdir algs4 [username:~/] cd algs4 [username:~/algs4/] mkdir bin [username:~/introcs/] sudo apt-get update [username:~/introcs/] sudo apt--jdk Part. II wget h…

https://docs.oracle.com/javase/7/docs/technotes/tools/windows/javac.html\ javac - Java programming language compiler Synopsis Description Options Command Line Argument Files Annotation Processing Searching for Types Programmatic Interface Examples Se…

引用:Java Programming Language Enhancements Java Programming Language Enhancements Enhancements in Java SE 7 Binary Literals - In Java SE 7, the integral types (byte, short, int, and long) can also be expressed using the binary number system. To specif…

import java.util.HashSet; public class JPTQuestion3 { public static void main(String[] args) { HashSet shortSet = new HashSet(); for (short i = 0; i < 100; i++) { shortSet.add(i); shortSet.remove(i - 1); } System.out.println(shortSet.size()); } } 输出:…

public class JPTQuestion2 { public static void main(String[] args) { String s3 = "JournalDev"; int start = 1; char end = 5; System.out.println(start + end); System.out.println(s3.substring(start, end)); } } 注意:这里的end是char类型,可是,输出结果和int型的end没区别.…

几天做项目,生成一堆注解的实体,当实体数超过86个时,jvm报错: # # A fatal error has been detected by the Java Runtime Environment: # #  Internal Error (c1_Optimizer.cpp:271), pid=5104, tid=6488 #  guarantee(x_compare_res != Constant::not_comparable) failed: incomparable constan…

import javax.swing.JOptionPanepublic class welcome {public static void main(string[] arg){JOptionPane.showMessageDialog(null,“welcome to java programming!”);} } public class welcome {public static void main(string[] arg){System.out.println("welcome t…

jdk已经安装过但是启动eclipse时提示“A Java Runtime Environment (JRE) or Java Development Kit (JDK) must be avail ” 解决方法 终端进入你的eclipse目录,然后输入: mkdir jrecd jre ln -s 你的JDK目录/bin bin…

一.报错环境:在Linux mint下,前几天还用得很好的的eclipse,今天开机不知为什么这样. Linux 下报错:A Java RunTime Environment (JRE) or Java Development Kit (JDK) must解决方案 - 天涯草 - 天涯草 Eclipse 3.6 在 linux mint 12 可以在终端顺利启动Eclipse,但是鼠标双击,或者用起动器启动就会出现如下的内容: A Java Runtime Environment (JRE) o…

java -jar yxCollector-1.1.0.jarError: opening registry key 'Software\JavaSoft\Java Runtime Environment'Error: could not find java.dllError: Could not find Java SE Runtime Environment.…