Divide List by page size - Java java.util

Java examples for java.util:List Split

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Description

Divide List by page size

Demo Code


//package com.java2s;

import java.util.Collections;
import java.util.List;
import java.util.Map;

public class Main {
    public static void main(String[] argv) {
        List list = java.util.Arrays.asList("asdf", "java2s.com");
        int page = 42;
        int size = 42;
        System.out.println(pageList(list, page, size));
    }//from w ww .ja v a2s . c o m

    public static <T> List<T> pageList(List<T> list, int page, int size) {
        if (page < 1) {
            throw new IllegalArgumentException(
                    "page should not little than 1,page:" + page);
        }
        if (size < 1) {
            throw new IllegalArgumentException(
                    "size should not little than 1,size:" + size);
        }
        if (isEmpty(list)) {
            return Collections.emptyList();
        }
        int totalSize = list.size();

        int fromIndex = (page - 1) * size > (totalSize - 1) ? 0
                : (page - 1) * size;

        int endIndex = (fromIndex + size) > (totalSize) ? (totalSize)
                : (fromIndex + size);

        return list.subList(fromIndex, endIndex);

    }

    public static <T> boolean isEmpty(List<T> list) {
        return list == null || list.isEmpty();
    }

    public static <K, V> boolean isEmpty(Map<K, V> map) {
        return map == null || map.isEmpty();
    }
}

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