implicit conversion:
two byte data type operation, the result is an int data type.
(byte, short) < int< long< float< Double;
an operation involving only a byte, short, the result will be converted to an int;
if other operations are involved, convert to a large data type according to the relational result above.
below are some code examples
public class TypeWay {
public static void main(String[] args) {
byte b1 = 1, b2 = 2;
System.out.println(getType(b1+b2));
}
public static String getType(Object a){
return a.getClass().toString();
}
}
运行结果：class java.lang.Integer
a byte data type and a short data type operation result in an int data type.
public class TypeWay {
public static void main(String[] args) {
byte b1 = 1;
short b2 = 2;
System.out.println(getType(b1+b2));
}
public static String getType(Object a){
return a.getClass().toString();
}
}
结果为：class java.lang.Integer
the following code means: an int and long data type operation, the result of the long data type.
public class TypeWay {
public static void main(String[] args) {
int b1 = 1;
long b2 = 2;
System.out.println(getType(b1*b2));
System.out.println("go and try");
}
public static String getType(Object a){
return a.getClass().toString();
}
}
结果为：class java.lang.Long
an int data type and a double data type operation result doule data type.
public class TypeWay {
public static void main(String[] args) {
int b1 = 1;
double b2 = 2.0;
System.out.println(getType(b1*b2));
System.out.println("go and try");
}
public static String getType(Object a){
return a.getClass().toString();
}
}
结果为：class java.lang.Double
: a float and a double operation results in a double operation.
public class TypeWay {
public static void main(String[] args) {
float b1 = 1.0f;
double b2 = 2.0;
System.out.println(getType(b1*b2));
System.out.println("go and try");
}
public static String getType(Object a){
return a.getClass().toString();
}
}
结果为：class java.lang.Double
conversion
directly precedes the data with the corresponding function of your conversion data type. However, there is no support for converting high-level data types to low-level data types.
here are some examples:
high data types cannot be converted to high data types.
public class TypeWay {
public static void main(String[] args) {
int b1 = 1;
int b2 = 2;
System.out.println(getType((byte)b1*b2));
}
public static String getType(Object a){
return a.getClass().toString();
}
}
结果是：class java.lang.Integer
low data type converted to high data type:
public class TypeWay {
public static void main(String[] args) {
int b1 = 1;
int b2 = 2;
System.out.println(getType((long)b1*b2));
}
public static String getType(Object a){
return a.getClass().toString();
}
}
结果是：class java.lang.Long
make sure that the SDK versions under the Project are the same
make sure that the Language level version in Sources is the same as the one used
make sure that the Module SDKl version is the same as the one used
