java例程练习（容器类简单练习）

import java.util.ArrayList; import java.util.Collection; public class Test { public static void main(String[] args) { Collection<Object> c = new ArrayList<Object>(); c.add("hello"); c.add(new Name("f1", "l1")); c.add(new Integer(100)); System.out.println(c.size()); System.out.println(c); } } class Name { private String firstName; private String lastName; Name(String firstName, String lastName) { this.setFirstName(firstName); this.setLastName(lastName); } public void setFirstName(String firstName) { this.firstName = firstName; } public String getFirstName() { return firstName; } public void setLastName(String lastName) { this.lastName = lastName; } public String getLastName() { return lastName; } public String toString() { return firstName + " " + lastName; } } //精彩继续<pre name="code" class="java">import java.util.ArrayList; import java.util.Collection; public class Test { public static void main(String[] args) { Collection<Object> c = new ArrayList<Object>(); c.add("hello"); c.add(new Name("f1", "l1")); c.add(new Integer(100)); System.out.println(c.size()); System.out.println(c); System.out.println(); c.remove("hello"); c.remove(new Integer(100)); System.out.println(c.remove(new Name("f1", "l1"))); System.out.println(c); } } class Name { private String firstName; private String lastName; Name(String firstName, String lastName) { this.setFirstName(firstName); this.setLastName(lastName); } public void setFirstName(String firstName) { this.firstName = firstName; } public String getFirstName() { return firstName; } public void setLastName(String lastName) { this.lastName = lastName; } 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(); } }