Javaの短縮形If...Else（三項演算子）

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super switch synchronized this throw throws transient try var void volatile while Java String Methods charAt() codePointAt() codePointBefore() codePointCount() compareTo() compareToIgnoreCase() concat() contains() contentEquals() copyValueOf() endsWith() equals() equalsIgnoreCase() format() getBytes() getChars() hashCode() indexOf() isEmpty() join() lastIndexOf() length() matches() offsetByCodePoints() regionMatches() replace() replaceAll() replaceFirst() split() startsWith() subSequence() substring() toCharArray() toLowerCase() toString() toUpperCase() trim() valueOf() Java Math Methods abs() acos() addExact() asin() atan() atan2() cbrt() ceil() copySign() cos() cosh() decrementExact() exp() expm1() floor() floorDiv() floorMod() getExponent() hypot() IEEEremainder() incrementExact() log() log10() log1p() max() min() multiplyExact() negateExact() nextAfter() nextDown() nextUp() pow() random() rint() round() scalb() signum() sin() sinh() sqrt() subtractExact() tan() tanh() toDegrees() 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It can be used to replace multiple lines of code with a single line, and is most often used to replace simple if else statements: Syntax variable = ( condition ) ? expressionTrue : expressionFalse ; Instead of writing: Example int time = 20; if (time < 18) { System.out.println("Good day."); } else { System.out.println("Good evening."); } Try it Yourself » You can simply write: Example int time = 20; String result = (time < 18) ? "Good day." : "Good evening."; System.out.println(result); Try it Yourself » You can also use the ternary operator directly inside System.out.println() without a temporary variable: Example int time = 20; System.out.println((time < 18) ? "Good day." : "Good evening."); Try it Yourself » Nested Ternary (Optional) You can nest ternary operators to handle more than two possible outcomes, but this can make your code harder to read: Example int time = 22; String message = (time < 12) ? "Good morning." : (time < 18) ? "Good afternoon." : "Good evening."; System.out.println(message); Try it Yourself » Tip: Use the ternary operator for short, simple choices. 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