* Comparable interface in our user defined class Author */Collections.sort(al);for(Authorstr:al){System.out.println(str.firstName+" "+str.lastName+" "+"Book: "+str.bookName);}}} Java Copy 输出: DeborahHopkinsonBoo
package tutorial;importjava.util.Arrays;publicclass PrimitiveSorting {publicstatic void main(String[]args){int[]numbers={5,3,8,2,1};System.out.println("原始数组:"+Arrays.toString(numbers));Arrays.sort(numbers);System.out.println("排序后的数组:"+Arrays.toString(numbers));char[]characters={'o...
import java.awt.Toolkit; import java.awt.event.ActionEvent; import java.awt.event.ActionListener; import java.util.Date; import javax.swing.JOptionPane; import javax.swing.Timer; public class InnerClassTest { public static void main(String[] args) { TalkingClock clock = new TalkingClock(1000,tr...
Java源码里是这样写的All elements in the list must implement the {@link Comparable}interface.Furthermore, all elements in the list must be mutually comparable (that is, {@code e1.compareTo(e2)} must not throw a {@code ClassCastException} for any elements Collections.sort源码 public static <...
Although it’s much more concise than other solutions, it can be a victim of integer overflows in Java: Playerplayer1=newPlayer(59,"John", Integer.MAX_VALUE);Playerplayer2=newPlayer(67,"Roger", -1); List<Player> players = Arrays.asList(player1, player2); ...
Arrays.sort(students);System.out.println(Arrays.toString(students));// 运行出错, 抛出异常.Exceptioninthread"main"java.lang.ClassCastException:Student cannot be cast to java.lang.Comparable 仔细思考, 不难发现, 和普通的整数不一样, 两个整数是可以直接比较的, 大小关系明确. 而两个学生对象的大小关系...
Comparable vs Comparator in Java Java provides two interfaces to sort objects using data members of the class: Comparable Comparator Using Comparable Interface A comparable object is capable of comparing itself with another object. The class itself must implements thejava.lang.Comparableinterface to comp...
Java比较器 必须定义compare(o1, o2) 比较类型的两个实例的多种方法-例如 按年龄,姓名比较人 我们可以为我们无法控制的类提供比较器 我们可以有多个比较器的实现 旨在实现对第三方类实例的排序 Java内置比较器示例 publicclassJavaBuiltInComparator{publicstaticvoidmain(String[] args){ ...
import java.util.Comparator; public class Employee implements Comparable<Employee> { private int id; private String name; private int age; private long salary; public int getId() { return id; } public String getName() { return name;
Comparable Comparable是java.lang包下的一个接口，其内部构造非常简单，只有一个compareTo()方法，使用...