Map的遍历

public class Demo04 {
    public static void main(String[] args) {
        HashMap<Person, String> java0723=new HashMap<Person,String>();
        HashMap<Person,String> java0611=new HashMap<Person,String>();
        HashMap<String, HashMap<Person, String>> oracle=new HashMap<String,HashMap<Person,String>>(); 
        //内部赋值
        java0723.put(new Person("武千策",22), "男");
        java0723.put(new Person("许勇革",21), "男");
        java0611.put(new Person("王伟业",20), "男");    
        java0611.put(new Person("宋义",25), "男");        
        //外部赋值
        oracle.put("java0611", java0611);
        oracle.put("java0723", java0723);
        get1(oracle);
        get2(oracle);
        get3(oracle);
        get4(oracle);
        get5(oracle);
        get6(oracle);
        get7(oracle);
        }
        //entrySet+interator外     
        public static void get7(HashMap<String,HashMap<Person,String>> oracle){
            System.out.println("get7方法");
            Set<Map.Entry<String,HashMap<Person,String>>> set=oracle.entrySet();
            Iterator<Map.Entry<String,HashMap<Person,String>>> it=set.iterator();
            while(it.hasNext()){
                Map.Entry<String,HashMap<Person,String>> out=it.next();
                //System.out.println("外key"+out.getKey()+"外value"+out.getValue());
                Set<Map.Entry<Person,String>> setin=out.getValue().entrySet();
                Iterator<Map.Entry<Person,String>> itin=setin.iterator();
                while(itin.hasNext()){
                    //遍历内部对象
                    Map.Entry<Person,String> in=itin.next();
                    System.out.println("外部key为:"+out.getKey()+",内部key为:"+in.getKey()
                    +",内部value为:"+in.getValue());
                }    
            }    
        }
        //keySet+iterator外   keySet+Iterator内
        public static void get6(HashMap<String,HashMap<Person,String>> oracle){
            System.out.println("get6方法");
            Set<String> set=oracle.keySet();
            Iterator<String> it=set.iterator();
            while(it.hasNext()){
                String outkey=it.next();
                //System.out.println(outkey+oracle.get(outkey));
                //获取内部的key
                Set<Person> inkey=oracle.get(outkey).keySet();
                //内部Key的迭代器对象
                Iterator<Person> itin=oracle.get(outkey).keySet().iterator();
                //对内部key遍历
                while(itin.hasNext()){
                    //内部key值
                    Person p=itin.next();
                    System.out.println("外部key为:"+outkey+",内部key为:"+p+",内部value为:"+oracle.get(outkey).get(p));
                }
            }
        }
        //keySet+iterator外  +keySet+增强for
        public static void get5(HashMap<String,HashMap<Person,String>> oracle){
            System.out.println("get5方法");
            Set<String> set=oracle.keySet();
            Iterator<String> it=set.iterator();
            while(it.hasNext()){
                //外部key
                String outkey=it.next();
                //System.out.println("外部key"+outkey+"外部value"+oracle.get(outkey));
                //获取内部key的对象
                Set<Person> inkey=oracle.get(outkey).keySet();
                //遍历内部Key
                for(Person init:inkey){
                    System.out.println("外部key为："+outkey+"，内部key为:"+init
                    +"，内部value为："+oracle.get(outkey).get(init));
                }
            }
        }
        //entrySet+Iterator外  entrySet+增强for内
        public static void get4(HashMap<String,HashMap<Person,String>> oracle){
            System.out.println("get4方法");
            //外部对象的结婚证对象
            Set<Map.Entry<String,HashMap<Person,String>>> set=oracle.entrySet();
            //获取迭代器对象
            Iterator<Map.Entry<String,HashMap<Person,String>>> it=set.iterator();
            while(it.hasNext()){
                Map.Entry<String,HashMap<Person,String>> out=it.next();
                //System.out.println("外部key"+out.getKey()+"外部value"+out.getValue());
                //获取内部对象的结婚证对象
                Set<Map.Entry<Person,String>> in=out.getValue().entrySet();
                for(Map.Entry<Person,String> setin:in){
                    System.out.println("外部key为："+out.getKey()+"，内部key为:"+setin.getKey()
                    +"，内部value为："+setin.getValue());
                }
            }    
        }
        //entrySet+Iterator外 entrySet+Iterator内
        public static void get3(HashMap<String,HashMap<Person,String>> oracle){
            System.out.println("get3方法");
            //获取外部结婚证对象
            Set<Map.Entry<String,HashMap<Person,String>>> set=oracle.entrySet();
            //获取外部对象的迭代器对象
            Iterator<Map.Entry<String,HashMap<Person,String>>> it=set.iterator();
            //迭代遍历
            while(it.hasNext()){
                //获取外部对象out
                Map.Entry<String,HashMap<Person,String>> out=it.next();
                //System.out.println("外部对象的key为"+out.getKey()+",外部对象的value为"+out.getValue());
                //获取内部对象的 结婚证对象的 迭代器对象itin，内部对象=外部对象的value=out.getValue();
                Iterator<Map.Entry<Person, String>> itin=out.getValue().entrySet().iterator();
                while(itin.hasNext()){
                    //获取内部对象in
                    Map.Entry<Person,String> in=itin.next();
                    System.out.println("外部key为:"+out.getKey()+",内部key为:"+in.getKey()+",内部value为:"+in.getValue());
                }
            }
                    
        }
        
        //keySet+增强for外  keySet+增强for内
        public static void get1(HashMap<String,HashMap<Person,String>> oracle){
            System.out.println("get1方法");
            //1.获取装有外部所有key的set集合
            Set<String> bigKeys=oracle.keySet();
            //2.循环遍历外部的每一个Key
            for(String bigkey:bigKeys){
                //根据每一个Key获取对应的value
                HashMap<Person,String> bigValue=oracle.get(bigkey);
                //获取内部的所有key所在的集合
                Set<Person> keys=bigValue.keySet();
                //循环遍历获取到每一个内部key
                for(Person key:keys){
                    System.out.println(bigkey+":"+key+":"+bigValue.get(key));
                }
            }
        }
        //entrySet+Iterator外 entrySet+Iterator内
        public static void get2(HashMap<String,HashMap<Person,String>> oracle){
            System.out.println("get2方法");
            //获取外部结婚证对象集合
            Set<Map.Entry<String,HashMap<Person,String>>> bigentrys=oracle.entrySet();
            //获取迭代器对象
            Iterator<Map.Entry<String,HashMap<Person,String>>> bigit=bigentrys.iterator();
            //循环遍历外部
            while(bigit.hasNext()){
                //获取每一个结婚证对象
                Map.Entry<String,HashMap<Person,String>> bigentry=bigit.next();
                //从每一个结婚证对象中获取外部的key
                String bigkey=bigentry.getKey();
                //获取外部的value
                HashMap<Person,String> bigvalue=bigentry.getValue();
                //获取内部的所有结婚证对象集合
                Set<Map.Entry<Person,String>> sentry=bigvalue.entrySet();
                //获取内部所有结婚证对象的迭代器对象
                Iterator<Map.Entry<Person,String>> sit=sentry.iterator();
                while(sit.hasNext()){
                    //获取每一个内部的结婚证对象
                    Map.Entry<Person,String> entry=sit.next();
                    //获取每一个内部的key
                    Person skey=entry.getKey();
                    String svalue=entry.getValue();
                    System.out.println(bigkey+":"+skey+":"+svalue);
                }        
            }
        }
        
    
}