Java Scanner语法
2020-12-13 16:44
标签:test 类型 play hid 有关 com ati 开始 splay 1.导入: import java.util.Scanner; 2.创建对象 Scanner scan = new Scanner();//一般变量名为scan或者in 最后关闭,scan.close();和I/O流有关,暂不清楚,照抄先。 3.next() 读取字符串,要读取到有效字符后才结束输入,不能读取空格,即遇到空格就停。 输入:123 456 789 1011 输出: 123 s1第一次读取到有效字符1,遇到4前的空格结束第一次输入;随后s2遇到第一个有效字符4,遇到空格结束;s3遇到第一个有效字符7,同理遇到空格结束,此时还有未读取的字符在缓冲区里,用hasNext()判断; 4.hasNext() 判断是否还有输入的数据,不能识别空格或回车,还会吃掉空格或者回车,连续的空格加回车一次性全部吸收掉,ACM里用循环读取下一组数据。 5.nextLine() 和next()类似,唯一不同就是,next()遇到空格或者回车就断了,nextLine()遇到回车才断,空格也算是有效字符,从第一个有效字符开始直到回车,中间无论多少空格都能吃下。 6.hasNextLine() 可以判断空格和回车,但是不会吃掉任何字符。 7.其他类型的输入 nextDouble(); nextLong(); nextInt(); nextFloat(); nextByte(); Java Scanner语法 标签:test 类型 play hid 有关 com ati 开始 splay 原文地址:https://www.cnblogs.com/shoulinniao/p/11621234.html Scanner scan = new Scanner(System.in);
String s1 = new String();
String s2 = new String();
String s3 = new String();
s1 = scan.next();
s2 = scan.next();
s3 = scan.next();
System.out.println(s1);
System.out.println(s2);
System.out.println(s3);
if(scan.hasNext())
System.out.println("Yes");
456
789
Yespackage my_acm;
import java.util.Scanner;
public class MyTest10 {
public static void main(String[] args) {
Scanner scan = new Scanner(System.in);
String s1 = new String();
String s2 = new String();
String s3 = new String();
String s4 = new String();
s1 = scan.next();
s2 = scan.next();
s3 = scan.next();
s4 = scan.nextLine();
System.out.println(s1);
System.out.println(s2);
System.out.println(s3);
System.out.println(s4);
if(scan.hasNext())
System.out.println("Yes1");
if(scan.hasNextLine())
System.out.println("Yes2");
}
}
/**输入:123 456 789 1011 12 13 14 15
输出:
123
456
789
1011 12 13 14 15
s4把9后面的全部字符全部都吃下去了,没有未读取的字符
*/
import java.util.Scanner;
public class MyTest10 {
public static void main(String[] args) {
Scanner scan = new Scanner(System.in);
String s1 = new String();
String s2 = new String();
String s3 = new String();
String s4 = new String();
s1 = scan.next();
s2 = scan.next();
s3 = scan.next();
System.out.println(s1);
System.out.println(s2);
System.out.println(s3);
if(scan.hasNext())
System.out.println("Yes1");
if(scan.hasNextLine())
System.out.println("Yes2");
scan.close();
}
}
import java.util.Scanner;
public class MyTest10 {
public static void main(String[] args) {
Scanner scan = new Scanner(System.in);
String s1 = new String();
String s2 = new String();
String s3 = new String();
String s4 = new String();
s1 = scan.next();
s2 = scan.next();
s3 = scan.next();
System.out.println(s1);
System.out.println(s2);
System.out.println(s3);
if(scan.hasNextLine())
System.out.println("Yes2");
if(scan.hasNextLine())
System.out.println("Yes3");
if(scan.hasNext())
System.out.println("Yes1");
scan.close();
}
}