知識點：

1、Collections的使用。

2、自定義類泛型的使用。

3、自定義類，toString();equals();hashCode()方法的重寫。

1 import java.util.*; 2 3 public class MyComparableTest{ 4 public static void main(String[] args) { 5 List<Name> a=new LinkedList<Name>(); 6 a.add(new Name("shang","zeng")); 7 a.add(new Name("qi","li")); 8 a.add(new Name("mei","niang")); 9 a.add(new Name("peingfei","chen")); 10 11 System.out.println(a); 12 Collections.sort(a); 13 System.out.println(a); 14 15 16 System.out.println(a.remove(new Name("peingfei","chen"))); 17 System.out.println(a); 18 19 } 20 } 21 22 class Name implements Comparable<Name>{ 23 String firstname,lastname; 24 25 public Name(String firstname,String lastname){ 26 this.firstname=firstname; 27 this.lastname=lastname; 28 } 29 30 public String toString(){ 31 return(firstname+" "+lastname); 32 } 33 34 /* //equals()method one 35 public boolean equals(Object obj){ 36 if (obj==null){ return false; } 37 else 38 { if(obj instanceof Name) 39 { 40 Name n = (Name)obj; 41 if (this.firstname.equals(n.firstname) && this.lastname.equals(n.lastname)){return true;} 42 } 43 44 return false; 45 } 46 } 47 */ 48 // equals()methoed two 49 public boolean equals(Object obj){ 50 if(obj instanceof Name){ 51 Name n=(Name)obj; 52 return (this.firstname.equals(n.firstname)) 53 && (this.lastname.equals(n.lastname)); 54 } 55 56 return super.equals(obj); 57 } 58 59 public int hashCode(){ return firstname.hashCode(); } 60 61 public int compareTo(Name o){ 62 int lastnamecompare=lastname.compareTo(o.lastname); 63 return 64 (lastnamecompare!=0?lastnamecompare:firstname.compareTo(o.firstname)); 65 } 66 }

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轉載于:https://www.cnblogs.com/jasonzeng888/p/5703388.html

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