[英]How to read multiple inputs on same line in Java?
所以我试图从一行读取所有输入,使用扫描仪,然后取值并找到第二大。 我会使用一个数组,但我不被允许。 您应该输入 10 个整数,按 Enter 并计算它们。
像这样的东西:
10 20 30 40 50 60 70 80 90 100 ENTER
Second highest number is: 90
我根本无法解决它。 这应该很容易,但我不知道。
public class SecondLargest {
public static void main(String[] args) {
{
int largest = 0;
int secondLargest = 0;
Scanner sc = new Scanner(System.in);
System.out.print("Enter integers: ");
int numbers = sc.nextInt();
largest = numbers;
while (sc.hasNextInt()) {
if (numbers > largest) {
secondLargest = largest;
largest = numbers;
} else if (numbers > secondLargest) {
secondLargest = numbers;
}
}
System.out.println("Second largest number is: " + secondLargest);
sc.close();
}
}
/*
**In this code I've used BufferedReader class which is faster than Scanner
Class as well as have large buffer of 8KB while Scanner has only 1KB.**
*/
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
public class Second_Highest {
public static void main(String[] args) throws IOException
{
BufferedReader br=new BufferedReader(new InputStreamReader(System.in));
String[] s=br.readLine().split(" ");
int a[]=new int[10];
int max=Integer.parseInt(s[0]);
for(int i=0;i<10;i++)
{
a[i]=Integer.parseInt(s[i]);
if(a[i]>max)
{
max=a[i];
}
}
int secondmax=Integer.parseInt(s[0]);
for(int i=0;i<10;i++)
{
if(a[i]>secondmax && a[i]<max)
{
secondmax=a[i];
}
}
System.out.print(secondmax);
}
}
要读取单行输入,您可以简单地通过吃 (\\n) 这是 Java 中的新行来做到这一点。
输入:1 2 3
\\Create the object of Scanner Class
Scanner sc = new Scanner(System.in);
int a = sc.nextInt();
int b = sc.nextInt();
int c = sc.nextInt();
// this will eat the new line and move forward for other inputs.
sc.nextLine()
循环读取或存储在二维数组中。
输入:1 2 3 3 4 5 6 7 8
//... do the above declaration of array
for ( int i = 0; i < n; i++){
for( int j = 0; j < m; j++){
arr[i][j] = sc.nextInt()
}
sc.nextLine(); // you need to eat the \n here.
}
这将完美地工作。
现在您应该能够在一行中轻松获取输入。
下面的代码片段可用于在同一行上获取多个整数输入。
Scanner sc= new Scanner(System.in); // Declare and Initialize Scanner
while(sc.hasNext()) // While the input has data execute
System.out.println(sc.nextInt()); // nextInt() method is used to take Integer data
对于由空格或逗号分隔的同一行上的多个字符串输入,我们可以使用以下代码段
Scanner sc = new Scanner(System.in).useDelimiter("[,\\s+]");
你可以这样做:
import java.util.Scanner;
public class SecondLargest {
public static void main(String[] args) {
Scanner sc = new Scanner(System.in);
System.out.print("Enter 10 integers separated by single spaces: ");
String str = sc.nextLine();
int last = str.lastIndexOf(" ");
int num = Integer.parseInt(str.substring(0, str.indexOf(" ")));
int largest = num;
int secondLargest = num;
int index = str.indexOf(" ");
for (int i = 1; i < 10; i++) {
str = str.substring(index + 1);
index = str.indexOf(" ");
if (index != -1) {
num = Integer.parseInt(str.substring(0, index));
if (num > largest) {
secondLargest = largest;
largest = num;
}
}
}
System.out.println("The second largest number is: " + secondLargest);
}
}
示例运行:
Enter 10 integers separated by single spaces: 10 23 4 12 80 45 78 90 105 7
The second largest number is: 90
注意:这只是假设输入格式正确的示例程序。 我让你来研究如何处理错误的输入。 这对你来说将是一个很好的锻炼。 如果您需要任何进一步的帮助,请随时发表评论。 祝你好运!
import java.util.*;
public class m1{
public static void main(String args[]){
Scannerscan = new Scanner(System.in);
Stringnum = scan.nextLine();
String[] strs = num.split("\\s+");
int[] arrs = new int[strs.length];
for(inti=0;i<strs.length;i++)
{
String stringnum = strs[i];
arrs[i] = Integer.parseInt(stringnum);
if(arrs[i]%2==0){
System.out.print(" ");
}
else{
System.out.print(arrs[i]);
}
}
scan.close();
}
}
声明:本站的技术帖子网页,遵循CC BY-SA 4.0协议,如果您需要转载,请注明本站网址或者原文地址。任何问题请咨询:yoyou2525@163.com.