class MyClass implements Comparable<MyClass>{

    private int x;

    private int y;

    public MyClass(int x,int y){

        this.x=x;

        this.y=y;

    }

    @Override

    public int compareTo(MyClass o) {

        //按照y进行升序排序

        return y<o.y?-1:(y==o.y?0:1);

    }

    @Override

    public String toString(){

        return x+"@"+y;

    }

}

main函数

List<MyClass> list=new ArrayList<>(Arrays.asList(new MyClass(1,2),new MyClass(3,1),new MyClass(2,3)));

Collections.sort(list);

System.out.println(list);

结果：

[3@1, 1@2, 2@3]

class MyClass{

    public int x;

    public int y;

    public MyClass(int x,int y){

        this.x=x;

        this.y=y;

    }

    @Override

    public String toString(){

        return x+"@"+y;

    }

}

class MyComparator implements Comparator<MyClass>{

    @Override

    public int compare(MyClass o1,MyClass o2){

return o1.x<o2.x?-1:(o1.x==o2.x?(o1.y<o2.y?-1:(o1.y==o2.y?0:1)):1);

} } 

main函数 

List<MyClass> list=new ArrayList<>(Arrays.asList(new MyClass(1,2),new MyClass(3,1),new MyClass(3,3),new MyClass(3,2),new MyClass(2,3)));
Collections.sort(list,new MyComparator());
System.out.println(list);

结果： [1@2, 2@3, 3@1, 3@2, 3@3]

class MyClass implements Iterable<Integer>{

    public List<Integer> list=new ArrayList<>(Arrays.asList(new Integer(1),new Integer(2),new Integer(3)));

    @Override

    public Iterator<Integer> iterator() {

        return list.iterator();

    }

    @Override

    public String toString(){

        return super.toString();

    }

}

class MyClass implements Iterable<Integer>{

    int[] array=new int[]{1,2,3,4,5,6,7};

    int index=0;

    @Override

    public Iterator<Integer> iterator() {

        return new Iterator<Integer>() {

            @Override

            public boolean hasNext() {

                return index<array.length;

            }

            @Override

            public Integer next() {

                return array[index++];

            }

            @Override

            public void remove() {

                throw new UnsupportedOperationException();

            }

        };

    }

    @Override

    public String toString(){

        return super.toString();

    }

}

public class TaskTimeoutDemo {

    public static void main(String[] args) {

        Scanner scanner=new Scanner(new MyClass(2));

        while(scanner.hasNext()){

            System.out.println(scanner.nextLine());

        }

    }

}

class MyClass implements Readable{

    private int count;

    public MyClass(int count){

        this.count=count;

    }

    @Override

    public int read(CharBuffer cb) throws IOException {

        if(count--==0) return -1;

        cb.append("Aa");

        cb.append("Bb");

        cb.append("Cc");

        cb.append("Dd");

        cb.append("Ee");

        cb.append("Ff");

        cb.append("Gg");

        cb.append("Hh");

        cb.append("Ii\n");

        return 1;

    }

}