Java Personal Learning Note: ternary

(conditions)? Statement 1: Statement 2

When the condition is true run statement 1

When the condition is false run statement 2

Statement 1 and type one of statement 2

The difference between ternary operator and If-else

Ternary operators can be simplified into if-else

Ternary operators require that a result be returned

If the code block can have more than one statement.

int j = 109;

int n1 = J & 15;
int n2 = (J >> 4) & 15;
String C1 = (N1 > 9)? (char) (n1-10 + ' a ') + "": (N1) + "";
String c2 = (N2 > 9)? (char) (n2-10 + ' a ') + "": (N2) + "";

String s = c1+ "" +C2;
System.out.println (s);

Converts 109 to 16 binary.
Train of thought displacement operation because 2 binary is converted to 16 binary is four-bit binary converted to one bit 16 binary

For example 60 (high ignore, all 0)

60

30 0

15 0

7 1

3 1

1 1

0 1

0011 1100 (32+16+8+4=60)

0011 1100

& 0000 1111

0000 1100 C

>> 4

0000 0011 (1100)

& 0000 1111

0000 0011 3

And then we know that 60 translates into a 16-in-one high is 3-low is C

You can then use the Swtich statement to convert. A represents ten B for 11 other invariant and so on

You can also use the method above. (char) (a–10 + ' a ') because a corresponds to a sum of ten ' a ' and the previous value after the strong transfer to get a character. (because characters can be computed directly, the value of their Unicode is calculated, and a Unicode value is turned back to be a character again.) ）

Java Personal Learning Note: ternary