Update Chapter54.java

Author: rkgus24

Chapter54.java

@@ -0,0 +1,50 @@
+package chapter54;
+//Generic<String> gen = new Generic<String>();
+class Generic<T>{
+   T[] v;
+   void set(T[] n) {
+      v= n;
+   }
+   T[] get() {
+      return v;
+   }
+   void print() {
+      for(T o : v) {
+         System.out.print(o+" ");
+      }
+      System.out.println();
+   }
+}
+
+
+
+
+
+public class GenericEx {
+
+   public static void main(String[] args) {
+      Generic<String> gen = new Generic<String>();
+      String[] ss = {"홍길동","이순신","김유신"};
+      //String 제네릭 타입의 매게변수에 String 배열객체 전달
+      gen.set(ss);
+      gen.print();
+      System.out.println("---------------------");
+      for(String s : gen.get()) {
+         System.out.println(s);
+      }
+      System.out.println("----------------------");
+      Generic<Integer> gen2 = new Generic<Integer>();
+      Integer[] ii = {1,2,3};
+      //String 제네릭 타입의 매게변수에 Integer 배열객체 전달
+      //nogen.set(ii);//에러발생
+      gen2.set(ii);
+      //gen2.set(ss);//String형이므로 에러 발생
+      gen2.print();
+      System.out.println("---------------------");
+      for(Integer o : gen2.get()) {
+         //String s = (String) o //형변환 필요없음
+         System.out.println(o);
+      }
+   }
+
+}