Java常用类练习

public class Unit7_1{
	public static void main(String[] args){
		System.out.println(args.length);
		for(String str:args){
			System.out.println(str);
		}
	}

}

运行情况：

2.Scanner

import java.util.Scanner;
public class Unit7_2{
	public static void main(String[] args){
		Scanner scanner = new Scanner(System.in);
		scanner.useDelimiter("\n");//只把回车当做分隔符
		while(scanner.hasNext()){
			System.out.println(scanner.next());
		}
	}

}

运行结果：

不能编译则javac -encoding utf8 Unit7_2.java

2.2 scanner读取文本文件

import java.util.Scanner;
import java.io.File;
public class Unit7_4{
	public static void main(String[] args) throws Exception{
		Scanner scanner = new Scanner(new File("D:\\TMP\\java\\Unit7_4.java"), "utf8");//注意，如果文件不全，请指定编码方式第二个参数
		while(scanner.hasNextLine()){
			System.out.println(scanner.nextLine());
		}
	}

}