?? name.java
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import java.util.*;public class Name implements Comparable<Name> { private String firstName, lastName; public Name(String firstName, String lastName) { if (firstName==null || lastName==null) throw new NullPointerException(); this.firstName = firstName; this.lastName = lastName; } public String firstName() {return firstName;} public String lastName() {return lastName;} public boolean equals(Object o) { if (!(o instanceof Name)) return false; Name n = (Name)o; return n.firstName.equals(firstName) && n.lastName.equals(lastName); } public int hashCode() { return 31*firstName.hashCode() + lastName.hashCode(); } public String toString() {return firstName + " " + lastName;} public int compareTo(Name o) { Name n = o; int lastCmp = lastName.compareTo(n.lastName); return (lastCmp!=0 ? lastCmp : firstName.compareTo(n.firstName)); }}?? 快捷鍵說明
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