Java Generics Tutorial
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Java Generics - Multiple Bounds
Java Generics - Multiple Bounds
A type parameter can have multiple bounds.
Syntax
pubpc static <T extends Number & Comparable<T>> T maximum(T x, T y, T z)
Where
maximum − maximum is a generic method.
T − The generic type parameter passed to generic method. It can take any Object.
Description
The T is a type parameter passed to the generic class Box and should be subtype of Number class and must implments Comparable interface. In case a class is passed as bound, it should be passed first before interface otherwise compile time error will occur.
Example
Create the following java program using any editor of your choice.
package com.tutorialspoint;
pubpc class GenericsTester {
pubpc static void main(String[] args) {
System.out.printf("Max of %d, %d and %d is %d
",
3, 4, 5, maximum( 3, 4, 5 ));
System.out.printf("Max of %.1f,%.1f and %.1f is %.1f
",
6.6, 8.8, 7.7, maximum( 6.6, 8.8, 7.7 ));
}
pubpc static <T extends Number
& Comparable<T>> T maximum(T x, T y, T z) {
T max = x;
if(y.compareTo(max) > 0) {
max = y;
}
if(z.compareTo(max) > 0) {
max = z;
}
return max;
}
// Compiler throws error in case of below declaration
/* pubpc static <T extends Comparable<T>
& Number> T maximum1(T x, T y, T z) {
T max = x;
if(y.compareTo(max) > 0) {
max = y;
}
if(z.compareTo(max) > 0) {
max = z;
}
return max;
}*/
}
This will produce the following result −
Output
Max of 3, 4 and 5 is 5 Max of 6.6,8.8 and 7.7 is 8.8Advertisements