PAT 甲级1028 （Java实现）

代码如下：

package patA;

import java.util.ArrayList;
import java.util.Collections;
import java.util.Comparator;
import java.util.Scanner;

public class A1028 {

	public static void main(String[] args) {
		// TODO Auto-generated method stub
		Scanner sc = new Scanner(System.in);
		int number = sc.nextInt();
		int now = sc.nextInt();

		ArrayList<Student4> ar = new ArrayList<Student4>();
		for (int i = 0; i < number; i++) {
			Student4 stu = new Student4();
			stu.id = sc.next();
			stu.name = sc.next();
			stu.score = sc.nextInt();

			ar.add(stu);
		}

		// 用哪个比较器
		if (now == 1) {
			Comee1 com1 = new Comee1();
			Collections.sort(ar, com1);
			for (int i = 0; i < number; i++) {
				System.out.println(ar.get(i).id + " " + ar.get(i).name + " " + ar.get(i).score);

			}
		}
		if (now == 2) {
			Comee2 com2 = new Comee2();
			Collections.sort(ar, com2);
			for (int i = 0; i < number; i++) {
				System.out.println(ar.get(i).id + " " + ar.get(i).name + " " + ar.get(i).score);

			}
		}
		if (now == 3) {
			Comee3 com3 = new Comee3();
			Collections.sort(ar, com3);
			for (int i = 0; i < number; i++) {
				System.out.println(ar.get(i).id + " " + ar.get(i).name + " " + ar.get(i).score);

			}
		}
	}

}

class Student4 {
	String id;
	String name;
	int score;
}

// 比较器1,比较id
class Comee1 implements Comparator<Student4> {
	public int compare(Student4 stu1, Student4 stu2) {
		if (Integer.parseInt(stu1.id) < Integer.parseInt(stu2.id)) {
			return -1;
		} else if (Integer.parseInt(stu1.id) > Integer.parseInt(stu2.id)) {
			return 1;
		} else {
			return 0;
		}
	}
}

// 比较器2，比较名字
class Comee2 implements Comparator<Student4> {
	public int compare(Student4 stu1, Student4 stu2) {
		return stu1.name.compareTo(stu2.name);

	}
}

// 比较器，比分数
class Comee3 implements Comparator<Student4> {
	public int compare(Student4 stu1, Student4 stu2) {
		if (stu1.score > stu2.score) {
			return -1;
		} else if (stu1.score < stu2.score) {
			return 1;
		} else {
			return 0;
		}
	}
}

注意：

类名命名时要注意：Con, Prn, Aux, Clock$, Nul, Com1, Com2, Com3, Com4, Com5, Com6, Com7, Com8, Com9, Lpt(1~9) 均不可以.

最后

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