Mega Code Archive
0085 Casting Incompatible Types
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A narrowing conversion is to explicitly make the value narrower. A cast is an explicit type conversion. It has this general form:
(target-type) value
target-type specifies the desired type. The following code casts int type value to byte type value.
public class Main {
public static void main(String[] argv) {
int a = 1234;
byte b;
b = (byte) a;
System.out.println("a is " + a);
System.out.println("b is " + b);
}
}
The output:
a is 1234
b is -46
Truncation happens when assigning a floating-point value to an integer value. For example, if the value 1.23 is assigned to an integer, the resulting value will simply be 1.
public class Main {
public static void main(String args[]) {
byte b;
int i = 1;
double d = 1.123;
System.out.println("Conversion of double to int.");
i = (int) d;
System.out.println("d: " + d + " i: " + i);
System.out.println("Conversion of double to byte.");
b = (byte) d;
System.out.println("d: " + d + " b: " + b);
}
}
This program generates the following output:
Conversion of double to int.
d: 1.123 i: 1
Conversion of double to byte.
d: 1.123 b: 1
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