The first Java program - hello world
First program - hello world
First way
step
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Create a new Java file, the suffix name is changed to Java
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Open NOTEPAD ++ writing program source code, as shown
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Write a program and save, as shown
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Add CMD to the address bar of the Java file, open the console window, as shown
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Enter Javac HelloWorld.java, compile the Java file into a zona code file, generate a Class file, as shown
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Run the Class file through the java command, enter Java HelloWorld, get the program run results, as shown
Precautions
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Procedure of each word does not have problems
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Try to use the output of all English, there may be problems in the output of Chinese
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File names and class names must be consistent
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Don't use Chinese symbols
Compiling type and interpretation type
Second way - use Idea
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Open IDEA, create a new project, click Next to NEXT
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Right click on the SRC folder, New a java class, as shown
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Enter PSVM will automatically expand into main method, as shown
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Enter Sout will automatically expand into system.out.println ();
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Control the output statement of the program, as shown
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Click on the green arrow on the left, execute the program, as shown
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