[英]Generic method syntax
I have forgotten the syntax for a generic method: 我忘记了泛型方法的语法:
public static void swap <T> (T a, T b)
{...}
And I don't find anywhere some example.What's the correct syntax? 我找不到任何一个例子。什么是正确的语法?
Here I have written a sample piece which i have used for my application. You can get an idea from this.
public <C>void addColumn(Cell<C> cell, String headerText,
final GetValue<C> getter, FieldUpdater<DocumentType, C> fieldUpdater) {
Column<DocumentType, C> column = new Column<DocumentType, C>(cell) {
@Override
public C getValue(DocumentType object) {
return getter.getValue(object);
}
};
column.setFieldUpdater(fieldUpdater);
column.setHorizontalAlignment(HasHorizontalAlignment.ALIGN_CENTER);
getTable().addColumn(column, headerText);
getTable().setColumnWidth(column, 10, Unit.PX);
}
static <T> void swap(T a, T b) {..}
You have to declare your typed parameters before the return type (void in your case). 您必须在返回类型之前声明您键入的参数(在您的情况下为void)。
http://docs.oracle.com/javase/specs/jls/se5.0/html/classes.html#8.4 (see TypeParameters ) http://docs.oracle.com/javase/specs/jls/se5.0/html/classes.html#8.4 (参见TypeParameters )
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