An example Analysis of the handling of Java exception
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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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