Mainly introduces the use of Java and Javac commands.
Band package and without package,
Use the -classpath parameter if you want to use the third party package.
No package
Hello.java
Public Class Hello
{
Public static void main (String [] args) {
System.out.Println ("Hello");
}
}
C: /java/hello/hello.java
Compile
C: / java / hello> javac hello.java
Generate Class files
C: /java/hello/hello.class
run
C: / Java / Hello> Java Hello
2. Situation with package
The source file should be put on the package directory, which is definitely a good habit
Hello.java
Package my; // Note this sentence
Public Class Hello
{
Public static void main (String [] args) {
System.out.Println ("Hello");
}
}
C: /java/hello/my/hello.java
Compile
C: / java / hello / my> javac hello.java
Generate Class files
C: /java/hello/my/hello.class
run
C: / java / hello> java my.hello
3. The use of the-classpath parameter
Jar01.jar; jar02.jar; ...; jarn.jar class_name.java
Java -classpath.; jar01.jar; jar02.jar; ...; jarn.jar main_class_name
