What you learn on paper is shallow, but you know you have to do it in detail
--Lu You Ask the canal how clear it is to have a source of living water --Zhu Xi
instanceof is actually a binary operator in Java, used to determine the object## on the left #Whether it is an instance of the specific class on the right or its subclass, return boolean type data. Generally, when using non-generic collections (List, set, etc.), instanceof is often used. Since collections can store various objects, they generally need to be read when reading. corresponding judgment.
A {
}B A{
}Hello {
(String[] args) {
A a=A()B b=B()A aa=(a A)
{
System..println()}{
System..println()}
(b A){
System..println()} else{
System..println()}
(aa A)
{
System..println()}{
System..println()}
}
}true true false
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