join collection with separator - Java java.util

Java examples for java.util:Collection Join

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Description

join collection with separator

Demo Code


//package com.java2s;
import java.util.Collection;
import java.util.Map;
import java.util.Map.Entry;

public class Main {
    public static void main(String[] argv) {
        Collection list = java.util.Arrays.asList("asdf", "java2s.com");
        String separator = "java2s.com";
        System.out.println(join(list, separator));
    }/*from  w w  w .  j a  va  2  s  . c  o m*/

    public static String join(Collection<? extends Object> list,
            String separator) {
        StringBuilder sb = new StringBuilder();

        for (Object o : list) {
            sb.append(o.toString());
            sb.append(separator);
        }

        if (sb.length() > 0 && separator.length() > 0) {
            sb.delete(sb.length() - separator.length(), sb.length());
        }

        return sb.toString();
    }

    public static String join(Map<? extends Object, ? extends Object> map,
            String keyValueSeparator, String entrySeparator) {
        StringBuilder sb = new StringBuilder();

        for (Entry<? extends Object, ? extends Object> entry : map
                .entrySet()) {
            sb.append(entry.getKey().toString());
            sb.append(keyValueSeparator);
            sb.append(entry.getValue().toString());
            sb.append(entrySeparator);
        }

        if (sb.length() > 0 && entrySeparator.length() > 0) {
            sb.delete(sb.length() - entrySeparator.length(), sb.length());
        }

        return sb.toString();
    }
}

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