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There are three throw throws systems that automatically throw exceptions

Throw: declaring objects

Throws: acting on the method

Public static void main (String [] args)

{

String s = "abc"

If (s.equals ("abc"))

{

Throw new NumberFormatException ()

}

Else

{

/ / output

}

Int div (int a, int b) throws Exception

{

Return a / b

}

}

What are the collection classes in Java? the collections in Java are divided into four main categories:

1. List list: ordered and repeatable

2. Queue queue: orderly and repeatable

3. Set collection: non-repeatable

4. Map mapping: unordered, key unique, value not unique.

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