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Understanding Java Unary Operators, Modulus, and Type Conversions

This guide covers essential Java concepts like unary increment operators (prefix and postfix), modulus operations to check for even or odd numbers, and type conversions including narrowing and widening conversions. It explores various examples demonstrating the use of unary operators, compound assignment operators, and the importance of explicit casting for certain data types. By mastering these fundamental concepts, you will enhance your programming skills and understand how data types interact within Java.

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Understanding Java Unary Operators, Modulus, and Type Conversions

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  1. 연산자 unary increment prefix: ++x; int x = 5; int y = ++x; System.out.print( x + “, “ + y); unary increment postfix: x++; int x = 5; int y = x++; System.out.print( x + “, “ + y); Output Output File Edit WindowHelp File Edit WindowHelp 6, 6 6, 5

  2. modulus - % int x = 5 % 3; System.out.print(x); Output File Edit WindowHelp 2

  3. modulus - % 짝수? 홀수? if(x % 2 == 0)… 짝수 else…홀수

  4. Compound Operators • x += 5; • x -= 5; • x *= 5; • x /= 5; • x %= 5; int x = 10; • x = x + 5; • x = x – 5; • x = x * 5; • x = x / 5; • x = x % 5; • 15 • 5 • 50 • 2 • 0

  5. Implicit Narrowing Conversion byte b = 2; b = b + 10; byte b = 2; b +=10;

  6. 무슨 conversion? • short > int • byte > long • float > long • char > int • char > short • byte > char

  7. 무슨 conversion? • short > int • byte > long • float > long • char > int • char > short • byte > char • widening • widening • narrowing • widening • narrowing • narrowing

  8. conversions byte short int long char

  9. conversions between byte, short and char are ALWAYS narrowing conversions requiring explicit cast byte short int long char

  10. conversions between byte, short and char are ALWAYS narrowing conversions requiring explicit cast byte short char Narrowing Conversion

  11. conversions between byte, short and char are ALWAYS narrowing conversions requiring explicit cast byte char short Narrowing Conversion

  12. conversions between byte, short and char are ALWAYS narrowing conversions requiring explicit cast byte b = 16; char c = No! b;

  13. conversions between byte, short and char are ALWAYS narrowing conversions requiring explicit cast byte b = 16; char c = b; (char)

  14. 65535 127 byte -128 char 0

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