Mega Code Archive
0087 Automatic promotions can cause compile-time errors
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public class Main {
public static void main(String[] argv) {
byte b = 5;
b = b * 2; // Error! Cannot assign an int to a byte!
}
}
Compiling the code above generates the following errors:
D:\>javac Main.java
Main.java:4: possible loss of precision
found : int
required: byte
b = b * 2; // Error! Cannot assign an int to a byte!
^
1 error
If you understand the consequences of overflow, use an explicit cast.
public class Main {
public static void main(String[] argv) {
byte b = 50;
b = (byte) (b * 2);
System.out.println("b is " + b);
}
}
The output from the code above is:
b is 100
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