Intellij引发此错误，但是我正在实现它。这是我的主类MyList的子类，它基于ArrayList。
SubList（）类必须被称为抽象，或者必须在“列表”中实现抽象方法“ listIterator”
private class SubList extends MyList<AnyType>
{
private List<AnyType> original;
private int offset;
private int size;
public MyList<AnyType> subList( int from, int to )
{
return new SubList( this, from, to );
}
public SubList( int from, int to )
{ if( from < 0 || to > MyList.this.size( ) ) throw new IllegalArgumentException( from + " " + to + " " + MyList.this.size( ) );
original = MyList.this; offset = from; size = to - from; }
public SubList( SubList sub, int from, int to )
{ if( from < 0 || to > sub.size( ) ) throw new IllegalArgumentException( from + " " + to + " " + sub.size( ) );
original = sub.original; offset = sub.offset + from; size = to - from; }
public int size( )
{ return size; }
public AnyType get( int idx )
{ return original.get( offset + idx ); }
public AnyType set( int idx, AnyType x )
{ return original.set( offset + idx, x ); }
public boolean add( AnyType x )
{ throw new UnsupportedOperationException( ); }
public AnyType remove( int idx )
{ throw new UnsupportedOperationException( ); }
public boolean remove( Object x )
{ throw new UnsupportedOperationException( ); }
public boolean contains( Object x )
{ for( AnyType item : this ) if( item.equals( x ) ) return true; return false; }
public ListIterator<AnyType> listIterator( int idx )
{ return original.listIterator( offset + idx ); }
public Iterator<AnyType> iterator( )
{ return original.listIterator( offset ); }
}
有两种方法List：listIterator(int)和listIterator()。您似乎要覆盖前者，但不能覆盖后者。
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