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  1. /* package whatever; // don't place package name! */
  2.  
  3. import java.util.*;
  4. import java.lang.*;
  5. import java.io.*;
  6.  
  7. /* Name of the class has to be "Main" only if the class is public. */
  8. class Ideone
  9. {
  10. 	public static void main (String[] args) throws java.lang.Exception
  11. 	{
  12. 		// your code goes here
  13. 		Scanner scan=new Scanner(System.in);
  14. 		scan.useDelimiter("\n");//设置了分隔符后无法读入整数和小数，if语句判断都是false，为什么？
  15. 		System.out.println("请输入整数：");
  16. 		int num=0;
  17. 		if(scan.hasNextInt()){
  18. 		num=scan.nextInt();
  19. 		}else{
  20. 		System.out.println("输入的不是整数");
  21. 		scan.next();
  22. 		}
  23. 		System.out.println("请输入小数");
  24. 		float f=0f;
  25. 		if(scan.hasNextFloat()){
  26. 		f=scan.nextFloat();
  27. 		}else{
  28. 		System.out.println("输入的不是小数");
  29. 		}
  30. 		System.out.println("整数："+num);
  31. 		System.out.println("小数"+f);
  32. 	}
  33. }
Success #stdin #stdout 0.17s 321344KB
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stdin
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1
2.1
stdout
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请输入整数：
请输入小数
整数：1
小数2.1
https://ideone.com/LWZXql
language:
Java (HotSpot 12)
created:
8 years ago
visibility:
public

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