How to execute java (command execution)

Method to execute java files: (Related video tutorial recommendations: java video tutorial)

Using environment: jdk1.6

File directory:

##javac *.java will generate the corresponding *.class file

java *.class can be executed, .class can be omitted

1. There is no package in t.java

public class t{    
public static void main(String[] args) {
    System.out.println("Hi");
    }
}

The first way

The second way

2. a.java is packaged

package test;
public class a{
    public static void main(String[] args) {
    System.out.println("Hi");
    }
}

The first way

The second method

Because a.java contains all the class files of the package, when executing the class file, you need to return to the layer where the package is located. Then execute

through the package name.

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