java learning main function parameter passing

Objective

(1). Create a class and write the program source code in the editor;

Note:

The command line parameters are array args of String type in the main method. You can use the Integer.valueOf() method to convert the string into an integer type, for example:

int number= Integer.valueOf(“12321421”)

The parameters of this method can only be numeric strings

(2), compile the program;

(3), run the program.

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Experimental part

Experimental code:

public class Average {

	/**
	 * @param args
	 */
	public static void main(String[] args) {
		// TODO Auto-generated method stub
		
		//获取三个字符参数
		String one = args[0];
		String two = args[1];
		String three = args[2];
			
		//将三个字符参数转为浮点型
		double int_One = Double.valueOf(one).doubleValue();
		double int_Two = Double.valueOf(two).doubleValue();
		double int_Three = Double.valueOf(three).doubleValue();
		
		double average = (int_One + int_Two + int_Three) / 3;
		System.out.println("平均数为："+average);				
	}
}

Program in MyEclipse, try the cmd command to compile and run.

Command line to compile java files:

javac Average.java

PS: javac is the command to compile java files, Average.java is your java file

command Run the java file:

java Average 3 4 5

PS: java is the command to run the java file, Average is the Java file name, and 3, 4, and 5 are the parameters to be passed to the main function.

Run results:

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