1：试写一个算法，由大至小依次输出顺序读入的三个整数值。
2：假设三个班参加学校运动会，项目共有四项，试编写算法，统计各班男女总分和团体总分。
3：设线性表存于a (1:  arrsize)的前elenum个分量中，且递增有序。试编写算法，用数组和链表分别实现将x插入到线性表的适当位置上，以保持线性表的有序性

作业？

import java.util.ArrayList;
import java.util.Collections;
import java.util.List;

import javax.swing.JOptionPane;

public class Test {
    public static void main(String[] args) {
        String inputStr = null;
        List<Integer> list = new ArrayList<>();
        try {
            for(int i=1; i<=3; i++) {
                inputStr = JOptionPane.showInputDialog("请输入第"+i+"整数");
                int val = Integer.parseInt(inputStr);
                list.add(val);
            }
        } catch (NumberFormatException e) {
            System.out.println("[error]"+e.getMessage());
            return;
        }
        list.sort(Collections.reverseOrder());
        System.out.println(list);
    }
}

package com.huawei.day25;

import java.util.HashMap;
import java.util.Map;

public class Test {
    private static final String ITEM_A = "item-a";
    private static final String ITEM_B = "item-b";
    private static final String ITEM_C = "item-c";
    private static final String ITEM_D = "item-d";
    //
    private static final String CLASS_KEY = "className";
    private static final String CLASS_A = "class-a";
    private static final String CLASS_B = "class-b";
    private static final String CLASS_C = "class-c";
    //
    private static final String GENDER_KEY = "gender";
    private static final String FEMALE = "female";
    private static final String MALE = "male";
    public static void main(String[] args) {
        // stuId,items
        Map<Integer, Map<String, Integer>> scoreMap = new HashMap<>();
        // stuId,info
        Map<Integer, Map<String, String>> infoMap = new HashMap<>();
        //
        Map<String, Integer> score = new HashMap<>();
        score.put(ITEM_A, 1);
        score.put(ITEM_B, 2);
        score.put(ITEM_C, 3);
        score.put(ITEM_D, 4);
        scoreMap.put(1, score);
        scoreMap.put(2, score);
        scoreMap.put(3, score);
        //
        Map<String, String> info = new HashMap<>();
        info.put(CLASS_KEY, CLASS_A);
        info.put(GENDER_KEY, FEMALE);
        infoMap.put(1, info);
        info = new HashMap<>();
        info.put(CLASS_KEY, CLASS_B);
        info.put(GENDER_KEY, MALE);
        infoMap.put(2, info);
        info = new HashMap<>();
        info.put(CLASS_KEY, CLASS_C);
        info.put(GENDER_KEY, FEMALE);
        infoMap.put(3, info);
        System.out.println(scoreMap);
        System.out.println(infoMap);
        // analysis result
        // class,score
        Map<String, Integer> classMap = new HashMap<>();
        // class,gender,score
        Map<String, Map<String,Integer>> stuMap = new HashMap<>();
        for(int stuId : scoreMap.keySet()) {
            Map<String, Integer> entry = scoreMap.get(stuId);
            String className = infoMap.get(stuId).get(CLASS_KEY);
            String gender = infoMap.get(stuId).get(GENDER_KEY);
            for(String itemName : entry.keySet()) {
                if(stuMap.get(className) == null) {
                    stuMap.put(className, new HashMap<>());
                }
                if(classMap.get(className) == null) {
                    classMap.put(className, 0);
                }
                if(stuMap.get(className).get(gender)==null) {
                    stuMap.get(className).put(gender, 0);
                }
                int tmpScore = stuMap.get(className).get(gender);
                stuMap.get(className).put(gender, tmpScore + entry.get(itemName));
                classMap.put(className, tmpScore + entry.get(itemName));
            }
        }
        System.out.println(classMap);
        System.out.println(stuMap);
    }
}

{1={item-d=4, item-c=3, item-b=2, item-a=1}, 2={item-d=4, item-c=3, item-b=2, item-a=1}, 3={item-d=4, item-c=3, item-b=2, item-a=1}}
{1={gender=female, className=class-a}, 2={gender=male, className=class-b}, 3={gender=female, className=class-c}}
{class-b=10, class-a=10, class-c=10}
{class-b={male=10}, class-a={female=10}, class-c={female=10}}

[此贴子已经被作者于2018-10-22 08:13编辑过]