Is it possible to change all list items in java?

Question

I have a list Stringand I want to perform the same operation on everyone Stringin the list.

Is this possible without performing a loop?

Answer 1

You can use apache commons util .

Answer 2

Well, something in a loop, somewhere - if you want to distract this into your own method, you can do it, but I do not believe that anything is built into the framework.

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Answer 3

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Answer 4

. .

 for(String s:yourlist){
       dooperation(s);
 }

Answer 5

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map(list, new Mapper<String, String>() {
    public String map(String input) {
        return doSomethingToString(input);
    }
);

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for (int i = 0; i < list.size(); i += 1) {
    list[i] = doSomethingToString(list[i]);
}

.

map(list, new DoSomethingToStringMapper());
map(otherlist, new DoSomethingToStringMapper());

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Answer 6

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Answer 7

, , : java.

http://www.gubatron.com/blog/2010/08/31/map-function-in-java/

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Answer 8

Java . , Groovy * . , . apply , , , - API . !

Answer 9

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Answer 10

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Answer 11

, .

List, , (removeAll ..).

Answer 12

Java API . Arraylist

, Arraylist java.util.ArrayList

ArrayList, .

import java.util.ArrayList;
//..
ArrayList ajay = new ArrayList(); 

• ArrayList →

• ajay →

, Arraylist:

ArrayList ajay<String> = new ArrayList<String>(10);

Arraylist .

add() ArrayList.And remove() .

:

import java.util.ArrayList;

public class MyClass {
    public static void main(String[ ] args) {
        ArrayList<String> ajay = new ArrayList<String>();
        ajay.add("Red");
        ajay.add("Blue");
        ajay.add("Green");
        ajay.add("Orange");
        ajay.remove("Green");

        System.out.println(colors);
    }
}

:

[Red,Blue,Orange]

Answer 13

The accepted return link is broken and the proposed solution is out of date:

CollectionUtils::forAllDo

@Deprecated

public static <T,C extends Closure<? super T>> C forAllDo(Iterable<T> collection, C closure)

Outdated. starting with 4.1, use IterableUtils.forEach(Iterable, Closure)instead of

Performs the specified closure on each element of the collection. If the input collection or closure is NULL, no change occurs.

---

you can use IterableUtils::forEach(Closure c)

Applies a closure to each element of the provided iteration.