add Element Before And After an Element in Collection - Java java.util

Java examples for java.util:Collection Element

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Description

add Element Before And After an Element in Collection

Demo Code


//package com.java2s;

import java.util.ArrayList;

import java.util.Collection;
import java.util.Collections;
import java.util.List;

public class Main {
    public static void main(String[] argv) {
        Collection collection = java.util.Arrays.asList("asdf",
                "java2s.com");
        String toAddBefore = "java2s.com";
        String toAddAfter = "java2s.com";
        System.out.println(addElementBeforeAndAfter(collection,
                toAddBefore, toAddAfter));
    }// w  ww.ja va 2 s .  c  om

    public static Collection<String> addElementBeforeAndAfter(
            Collection<?> collection, String toAddBefore, String toAddAfter) {
        if (collection == null || collection.isEmpty()) {
            return Collections.emptyList();
        }

        List<String> result = new ArrayList<>(collection.size());
        for (Object o : collection) {
            StringBuilder stringBuilder = new StringBuilder(o.toString()
                    .length() + toAddBefore.length() + toAddAfter.length());
            stringBuilder.append(toAddBefore);
            stringBuilder.append(o.toString().trim());
            stringBuilder.append(toAddAfter);
            result.add(stringBuilder.toString());
        }
        return result;
    }
}

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