java文件读取Scanner

从键盘读取System.in

需要import java.util.Scanner;

Scanner inputdata = new Scanner(System.in);

String stringData = inputdata.next();

从文件读取

需要import java.io.File;

File filedata = new File(“data.txt”);

Scanner fileReadData = new Scanner(filedata);

示例代码如下：

//使用Scanner读取数据
import java.util.Scanner;
import java.io.File;
public class j05{
public static void main(String[] args)throws Exception{
//输入测试
Scanner incmd1 = new Scanner(System.in);
System.out.println("input a String");
String xx = incmd1.next();
System.out.println("xx = " + xx );
//从文件中读取数据
File f05 = new File("f005.txt");
Scanner readit = new Scanner(f05);

while(readit.hasNext()){
String firstname = readit.next();
String middlename = readit.next();
String lastname = readit.next();
int score = readit.nextInt();
System.out.println(firstname + " " + middlename + " " + lastname + " " + score );
}
readit.close();
}
}