Java explorations with my student Modesto.
// These two have the same value
new String("test").equals("test") // --> true
// ... but they are not the same object
new String("test") == "test" // --> false
// ... neither are these
new String("test") == new String("test") // --> false
// This is the best way to check for string equalities. It checks for nulls and calls .equals()
import java.util.Objects
Objects.equals("CA", "TX") // --> false
Objects.equals("TX", "TX") // --> true
Objects.equals("test", new String("test")) // --> true
Objects.equals(null, "test") // --> false
// ... but these are because literals are interned by
// the compiler and thus refer to the same object
"test" == "test" // --> true
/* public static <return data type> <name>(<data type> <variabe1Name>, <data type> <variable2Name> ...) {
1. Declare data types: Ex -->
String hello;
int num;
double number1;
...
2. Write the body of the function here...
3. Make sure to add a return statement if the <return data type> is not void
4. Close squigly to end the scope.
}
*/
public static double sum(double a, double b) {
double result;
result = a + b;
return result;
}
// <functionName>(param1, param2, ...)
sum(1, 2) // --> 3
sum(5, 5) // --> 10
System.out.println(sum(1, 2))