generictest_3.java

基于netbeans的java桌面应用程序合集

package com.sun.tiger.generic;


import java.util.ArrayList;
import java.util.Collection;


public class GenericTest_3 {
    
    /** Creates a new instance of GenericTest_3 */
    public GenericTest_3() {
    }
    
    public static void main(String[] args) {
        ArrayList<String> sc = new ArrayList<String>();
        sc.add("String_0");
        sc.add("String_1");
        sc.add("String_2");
        
        Object[] oa = new Object[3];
        
        Converter.cToA(oa, sc);
        
        for (int i = 0; i < oa.length; i++) {
            System.out.println(oa[i]);
        }
    }
}

class Converter {
    public static void cToA(Object[] a, Collection<?> c) {
        int i = 0;
        
        if (a.length != c.size()) {
            return;
        }
        for (Object e: c) {
            a[i++] = e;
        }
    }

//    public static void aToC(Object[] a, Collection<?> c) {
//        for (Object o : a)
//            c.add(o);
//    }

}