Ex12_3 코드
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package org.javaro.lecture;
import java.util.*;
public class Ex12_3 {
public static void main(String[] args) {
System.out.println("조병수-20191121-콜렉션과 제너릭");
ArrayList<String> arrayList = new ArrayList<String>();
int idx = 0; String obj1 = "Korea"; String obj2 = "Seoul"; String obj3 = "Daejeon";
arrayList.add(obj1);
System.out.println("1="+arrayList.get(0));
arrayList.add(idx,obj2);
for(int i = 0; i <arrayList.size(); i++) {System.out.println("2="+arrayList.get(i));}
arrayList.set(idx,obj3);
for(int i = 0; i <arrayList.size(); i++) {System.out.println("3="+arrayList.get(i));}
idx = arrayList.indexOf(obj1);
arrayList.remove(idx);
int count = arrayList.size();
System.out.println(count);
Object[] str = arrayList.toArray();
for(int i = 0; i <str.length; i++) {System.out.println((String)str[i]);}
arrayList.clear();
}
}
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