Alex Tkachman
71 lines
1.5 KiB
Plaintext
71 lines
1.5 KiB
Plaintext
class A() {}
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class B<T>() {
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fun isT (a : Any?) : Boolean {
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return a is T
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}
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}
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fun t1() : Boolean {
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val a = A()
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if(a !is A) return false
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if(a !is A?) return false
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if(null !is A?) return false
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return true
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}
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fun t2 () : Boolean {
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val b = B<String>()
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if(b !is B<String>) return false
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if(b !is B<String>?) return false
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if(null !is B<String>?) return false
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val v = b as B<String> //ok
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val u = b as B<String>? //TypeCastException
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val w : B<String>? = b as B<String> //ok
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val x = w as B<String>? //TypeCastException
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return true
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}
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fun t3 () : Boolean {
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val b = B<String>()
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if(!b.isT("aaa")) return false
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if(b.isT(10)) return false
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if(b.isT(null)) return false
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val d = B<String?>()
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if(!d.isT("aaa")) return false
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if(d.isT(10)) return false
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if(!d.isT(null)) return false
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val f = B<java.lang.String?>()
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if(!f.isT("aaa")) return false
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if(f.isT(10)) return false
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if(!f.isT(null)) return false
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val c = B<Int>()
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if(c.isT("aaa")) return false
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if(!c.isT(10)) return false
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if(c.isT(null)) return false
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val e = B<Int?>()
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if(e.isT("aaa")) return false
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if(!e.isT(10)) return false
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if(!e.isT(null)) return false
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return true
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}
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fun box() : String {
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if(!t1()) {
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return "t1 failed"
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}
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if(!t2()) {
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return "t2 failed"
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}
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if(!t3()) {
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return "t3 failed"
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}
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return "OK"
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} |