arraylist - Java: How to read a text file -

i want read text file containing space separated values. values integers. how can read , put in array list?

here example of contents of text file:

1 62 4 55 5 6 77 

i want have in arraylist [1, 62, 4, 55, 5, 6, 77]. how can in java?

you can use files#readalllines() lines of text file list<string>.

for (string line : files.readalllines(paths.get("/path/to/file.txt"))) {     // ... } 

tutorial: basic i/o > file i/o > reading, writing , creating text files

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you can use string#split() split string in parts based on regular expression.

for (string part : line.split("\\s+")) {     // ... } 

tutorial: numbers , strings > strings > manipulating characters in string

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you can use integer#valueof() convert string integer.

integer = integer.valueof(part); 

tutorial: numbers , strings > strings > converting between numbers , strings

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you can use list#add() add element list.

numbers.add(i); 

tutorial: interfaces > list interface

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so, in nutshell (assuming file doesn't have empty lines nor trailing/leading whitespace).

list<integer> numbers = new arraylist<>(); (string line : files.readalllines(paths.get("/path/to/file.txt"))) {     (string part : line.split("\\s+")) {         integer = integer.valueof(part);         numbers.add(i);     } } 

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if happen @ java 8 already, can use stream api this, starting files#lines().

list<integer> numbers = files.lines(paths.get("/path/to/test.txt"))     .map(line -> line.split("\\s+")).flatmap(arrays::stream)     .map(integer::valueof)     .collect(collectors.tolist()); 

tutorial: processing data java 8 streams