ex1(3).java

JAVA编程思想第四版英文原版习题答案. pdf原版的

// containers/Ex1.java
// TIJ4 Chapter Containers, Exercise 1, page 809
/* Create a List (try both ArrayList and LinkedList) and fill it using
* Countries. Sort the list and print it, then apply Collections.shuffle()
* to the list repeatedly, printing it each time so that you can see how 
* the shuffle() method randomizes the list differently each time.
*/
import java.util.*;
import net.mindview.util.*;
import static org.greggordon.tools.Print.*;

public class Ex1 {
	public static void main(String[] args) {
		List<String> al = new ArrayList<String>();
		List<String> ll = new LinkedList<String>();
		for(int i = 0; i < Countries.DATA.length; i++) {
			al.add(Countries.DATA[i][0]);
			ll.add(Countries.DATA[i][1]);
		}
		Collections.sort(al);
		Collections.sort(ll);
		println("Countries: " + al);
		println("Capitals: " + ll);
		for(int i = 0; i < 2; i++) {
			Collections.shuffle(al);
			Collections.shuffle(ll);
			println("Countries " + i + ": " + al);
			println("Capitals " + i + ": " + ll);
		}
		List<String> al2 = new ArrayList<String>();
		List<String> ll2 = new LinkedList<String>();
		for(int i = 0; i < 10; i++) {
			al2.add(Countries.DATA[i][0]);
			ll2.add(Countries.DATA[i][1]);
		}
		for(int i = 0; i < 5; i++) {
			Collections.shuffle(al2);
			Collections.shuffle(ll2);
			println("Countries " + i + ": " + al2);
			println("Capitals " + i + ": " + ll2);
			Collections.sort(al2);
			Collections.sort(ll2);
		}
	}
}