Java -- ArrayList排序

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package team.bean;import java.io.IOException;import java.math.BigDecimal;import java.util.ArrayList;import java.util.Collections;import java.util.Comparator;import java.util.List;public class CollectionsTest {public static void main(String[] args) throws IOException {List<Number> dataSet = new ArrayList<Number>();dataSet.add(1);dataSet.add(9.6);dataSet.add(9.97F);dataSet.add(9.99F);dataSet.add(9.98F);dataSet.add(-2);dataSet.add((short)8);dataSet.add(new BigDecimal(7.8));dataSet.add(new BigDecimal(7.9));System.out.println(Collections.max(dataSet,new Com()));Collections.sort(dataSet,new Com());System.out.println();//System.out.println(dataSet.get(0).toString());}}class Com implements Comparator<Number>{@Overridepublic int compare(Number o1, Number o2) {Double num = (Double.parseDouble(o1.toString())-Double.parseDouble(o2.toString()));if(num>0)return 1;else if(num<0)return -1;else return 0;}}

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