起风网创建Scanner对象语法
Scanner scan = new Scanner(System.in);
使用next()获取输入的字符串
import java.util.Scanner;public class ScanTest1 { public static void main(String[] args) { Scanner scanner = new Scanner(System.in); if (scanner.hasNext()) { String str1 = scanner.next(); System.out.println("Input:" + str1); } scanner.close(); }}
使用nextLine()获取字符串
public class ScanTest2 { public static void main(String[] args) { Scanner scanner = new Scanner(System.in); if (scanner.hasNextLine()) { String str1 = scanner.nextLine(); System.out.println("Input:" + str1); } scanner.close(); }}
以上二者区别
nextLine()见到回车就结束，而next()必须得到有效字符
next()获取第一个空格前数据（比如，输入a b c得到a，输入 a b得到a）
使用nextInt()获取整数
public class ScanTest3 { public static void main(String[] args) { Scanner scanner = new Scanner(System.in); if (scanner.hasNextInt()) { int str1 = scanner.nextInt(); System.out.println("Input:" + str1); } scanner.close(); }}
同样，还有nextShort, nextFloat, nextDouble, nextBoolean, nextByte, nextChar, nextBigInteger, nextBigDecimal…
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