如何使用按行分割文本？

Question

I am trying to split data by lines, using the method split. This is the code i am trying to use but i can't figure out what to use for the parameters of .split(). This is how the data will be in the txt.

19
23
58
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Scanner sc = new Scanner(new File("random.txt")); 
string line = sc.nextLine(); 
String[] numbers = line.split(" "); 
int nums = new int[numbers.length]; 
for(int i=0;i<numbers.length;i++) 
nums[i] = Integer.parseInt(numbers[i]);

The end goal is so that the data can be put into an array, not to just print it.

Answer 1

You dont need to use split if you have only one number in each line.

just use the following

Scanner sc = new Scanner(new File("C:/projects/random.txt"));
        while( sc.hasNext()){
            System.out.println(sc.nextInt());
        }

Answer 2

Try to use it like this:

Scanner sc = new Scanner(new File("random.txt"));

int[] nums;

int i=0;

while(sc.hasNext()){

 String line = sc.nextLine(); nums[i] = Integer.parseInt(line); i++; 

}

Hope this helps.

Answer 3

Just as simple as that, you don't need split since you're reading line by line as @Luiggi Mendoza said

Scanner sc = new Scanner(new File("C:/projects/random.txt"));
while( sc.hasNext()){
    nums[i] = Integer.parseInt(numbers[i]); //They're stored in here
    i++;
}
int max = i; //To keep length of numbers that have been read
for(i = 0; i < max; i++){
    System.out.println(nums[i]); //We print them from the array
}

Answer 4

Try this

while(true){
        int tmp=line.indexOf(" ");
        if(tmp==-1)
            break;
        System.out.println(ar[i]);
        ar[i++]=Integer.parseInt(line.substring(0,tmp));
        line =line.substring(tmp+1);    
    }