Java Reference
In-Depth Information
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// Fig. 20.10: StackTest2.java
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// Passing generic Stack objects to generic methods.
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public class
StackTest2
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{
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public static void
main(String[] args)
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{
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Double
Integer
[] doubleElements = {
1.1
,
2.2
,
3.3
,
4.4
,
5.5
};
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[] integerElements = {
1
,
2
,
3
,
4
,
5
,
6
,
7
,
8
,
9
,
10
};
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// Create a Stack<Double> and a Stack<Integer>
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Stack<Double> doubleStack =
new
Stack<>(5);
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Stack<Integer> integerStack =
new
Stack<>();
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// push elements of doubleElements onto doubleStack
testPush(
"doubleStack"
, doubleStack, doubleElements);
testPop(
"doubleStack"
, doubleStack);
// pop from doubleStack
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// push elements of integerElements onto integerStack
testPush(
"integerStack"
, integerStack, integerElements);
testPop(
"integerStack"
, integerStack);
// pop from integerStack
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20
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}
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// generic method testPush pushes elements onto a Stack
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public static
<T>
void
testPush(String name , Stack<T> stack,
T[] elements)
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{
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System.out.printf(
"%nPushing elements onto %s%n"
, name);
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// push elements onto Stack
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for
(
T element : elements
)
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{
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System.out.printf(
"%s "
, element);
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stack.push(element);
// push element onto stack
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}
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}
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// generic method testPop pops elements from a Stack
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public static
<T>
void
testPop(String name, Stack<T> stack)
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{
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// pop elements from stack
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try
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{
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System.out.printf(
"%nPopping elements from %s%n"
, name);
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T popValue;
// store element removed from stack
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// remove all elements from Stack
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while
(
true
)
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{
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popValue = stack.pop();
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System.out.printf(
"%s "
, popValue);
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}
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}
Fig. 20.10
|
Passing generic
Stack
objects to generic methods. (Part 1 of 2.)
