java1234 Tutorial Series notes S1 Java SE 0101 HelloWorld

This section is divided into three speakers. Java Overview, section Two describes installing the JDK Configuration environment variable Section III speaks of the classic Hello World

1. Create a new TXT text

1  Public class chapter0102{2      Public Static void  3         System.out.println ("The first chapter first says Hello World third time homework!") "); 4     }5 }

2. Change the file suffix to. java. Put in an easy-to-access path (I put it on the e-drive)

3. Under the console, compile the Java you just wrote

Javac Chapter0102.java

If the file name differs from the class name, an error occurs: Class chapter0102 is public and should be named chapter0102 ....

After a successful run, it is spoken by the JVM. Java compiled as a. class

3. Running chapter0102

Running Java chapter0102 under the console

Console output:

java1234 Tutorial Series notes S1 Java SE 0101 HelloWorld