關(guān)于容器的remove方法：

有一個例子：
當remove中的對象和列表中的對象Equals函數(shù)為true時，
才會將列表中對象刪除掉。 注意：如果一個對象沒有重寫equals函數(shù)
將會調(diào)用父類的equals函數(shù) ，判斷是否兩個對象是否為同一個對象引用。

import java.util.*;

public class BasicContainer {
??? public static void main(String[] args) {
??????? Collection c = new HashSet();
??????? c.add("hello");
??????? c.add(new Name("f1","l1"));
??????? c.add(new Integer(100));
??????? c.remove("hello");
??????? c.remove(new Integer(100));
??????? System.out.println
????????????????? (c.remove(new Name("f1","l1")));
??????? System.out.println(c);
??? }


}

class Name implements Comparable {
??? private String firstName,lastName;
??? public Name(String firstName, String lastName) {
??????? this.firstName = firstName; this.lastName = lastName;
??? }
??? public String getFirstName() {? return firstName;?? }
??? public String getLastName() {?? return lastName;?? }
??? public String toString() {? return firstName + " " + lastName;? }
???
??? public boolean equals(Object obj) {
??? ??? if (obj instanceof Name) {
??? ??????? Name name = (Name) obj;
??? ??????? return (firstName.equals(name.firstName))
??? ??????????? && (lastName.equals(name.lastName));
??? ??? }
??? ??? return super.equals(obj);
??? ??? }
??? ??? public int hashCode() {
??? ??? ??? return firstName.hashCode();
??? ??? }
??? ???
??? ???
??? ???
??? ??? public int compareTo(Object o) {
??????? Name n = (Name)o;
??????? int lastCmp =
??????????? lastName.compareTo(n.lastName);
??????? return
???????????? (lastCmp!=0 ? lastCmp :
????????????? firstName.compareTo(n.firstName));
??? }
??? ???
}
?

轉(zhuǎn)載于:https://blog.51cto.com/344551/68978

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