Interesting three-mesh operator "?:" in Java

Programs that have had a programming experience apes generally know the trinocular operator "?:", the following is a review of the use of this operator, the expression is: Condition?expression1:expression2.

That is, when condition is true, calculate exression1, otherwise calculate expression2, for example:

X<y?x:y

Returns the smaller of the values in X and Y.

Let's look at a few more examples below:

Example 1

        int i=55;        String s= (i<60)? " You ":(i<50)?" He ":" Me ";        System.out.println (s);

Because the trinocular operator is right-associative, the output is: you.

Example 2

        int i=8;        System.out.println (i<3?10.2:8);

Operation, Java will automatically type conversions based on the operator's precision type, so the output is: 8.0.

Example 3

int i=10;
Char a= ' a ';
System.out.println (FALSE?10:A);
System.out.println (FALSE?I:A);

The output is: a,97.

The Java programming specification mentions that when the latter two expressions have a constant expression (10 in the case) and the other type T (char in the case), while the constant expression can be represented by T, the output is the T type, so the first output is a; because I is a variable, type int, B is promoted to type int, so the second output is 97.

Interesting three-mesh operator "?:" in Java