201521123089 Java programming 1th Week of study summary

1. Summary of this week's study

Learn the history of Java and Jdk,jvm,jre;

2. Written work

1. Why are Java programs running across platforms? What are the steps to execute a Java program?

Java has a JVM that is actually running on a virtual machine.

2. What is the difference between a JDK?JDK,JRE,JVM?

The JDK (Java Development Kit) is the Java SDK, the development environment on the Java platform;

The JRE (Java Runtime Environment) includes virtual machines and related environments, and the JVM (Java Virtual machine) is a Java VM

3.java HelloWorld Command, what does this parameter refer to in HelloWorld?

HelloWorld is the class name.

What is the use of 4.path variables? What is the use of classpath variables?

The function of the path variable is to set the search path for executing the command. The Classpath function is to specify the class search path.

5. What is the difference between writing a program in Java and running a program and running it with the C language, and the intermediate and target files that are generated?

The generated file format for the C language is. cpp and the destination file is. exe.

The generated file format for the Java authoring process is. class, and the destination file is. java.

What are the 3 app versions of the 6.Java language? What is the relationship between versions?

Standard Java Standards Edition, Enterprise Edition Java Enterprises Edition, mobile Java Mirco Edition. .

What is the difference between a 7.Oracle jdk and an open JDK?

The former is used only for personal research purposes and prohibits any commercial use, while the latter allows for commercial usage.

What are the main applications of 8.Java? What are your goals and expectations in this course?

Java is mainly used in enterprises, my goal is to write some of my own small programs.

3. Using the code cloud to manage Java code

4. Experimental summary

The feeling is similar to the C language study, should write the procedure more, practice more.

201521123089 Java programming 1th Week of study summary