Java generics multiple arguments with constraints

Question

I was able to find how to declare generics with single argument and multiple constrains and generics with multiple arguments, but strangely enough, not a generic with multiple argument and constraints:

public class Page<U, T implements IPaginableBy<U>> extends ArrayList<T> { }

gives me syntax error after T: "java: > expected". Is it not possible to constrain a an argument on generic type more than one argument?

Eran · Accepted Answer · 2016-01-10 12:08:24Z

3

Change

public class Page<U, T implements IPaginableBy<U>> extends ArrayList<T> { }

to

public class Page<U, T extends IPaginableBy<U>> extends ArrayList<T> { }

Constrained type arguments always use the extends keyword.

answered Jan 10, 2016 at 12:08

Eran

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1 Comment

wondra Over a year ago

Accepting this answer when it allows me (10 mins). Sorry, this was a dumb syntax error - this (redundant?) differentiation between extends and implements is a bit confusing.

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