数组转换的不可调用

方法不可调用

import java.util. * ;

public class Unsupported {

static List a = Arrays.asList( //----〉Arrays被转换成为List类，List类中方法被禁用

" one two three four five six seven eight " .split( " " ));

static List a2 = a.subList( 3 , 6 );

public static void main(String[] args) {

System.out.println(a);

System.out.println(a2);

System.out.println( " a.contains( " + a.get( 0 ) + " ) = " +

a.contains(a.get( 0 )));

System.out.println( " a.containsAll(a2) = " +

a.containsAll(a2));

System.out.println( " a.isEmpty() = " + a.isEmpty());

System.out.println( " a.indexOf( " + a.get( 5 ) + " ) = " +

a.indexOf(a.get( 5 )));

// Traverse backwards:

ListIterator lit = a.listIterator(a.size());

while (lit.hasPrevious())

System.out.print(lit.previous() + " " );

System.out.println();

// Set the elements to different values:

for ( int i = 0 ; i < a.size(); i ++ )

a.set(i, " 47 " );

System.out.println(a);

// Compiles, but won't run:

lit.add( " X " ); // Unsupported operation

a.clear(); // UnsupportedList类中方法被禁用

a.add( " eleven " ); // Unsupported

a.addAll(a2); // Unsupported

a.retainAll(a2); // Unsupported

a.remove(a.get( 0 )); // Unsupported

a.removeAll(a2); // Unsupported

}

} // /:~

posted on 2007-02-03 21:44 youngturk 阅读(170) 评论(0) 编辑收藏所属分类: 个人随笔总结

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