在Java中，if語(yǔ)句檢查它操作數(shù)是true還是false，操作數(shù)只能是booleanboolean b = true;

if (b) {

System.out.println("b was true");

}

boolean b = isVowel('a');

if (b) {

System.out.println("a is a vowel");

}

現(xiàn)在，你不需要變量，可以內(nèi)聯(lián)它，并且直接使用方法調(diào)用的結(jié)果：if (isVowel('e')) {

System.out.println("e is a vowel too");

}

請(qǐng)注意，一些運(yùn)算符，如==，!=， 3;

boolean equal = null == null;

boolean different = new Object() == new Object();

if (greater) {

System.out.println("5 is greater than 3");

}

if (equal) {

System.out.println("null equals null");

}

if (different) {

System.out.println("Two object instances have different idententity");

}

if (5 > 3) {

System.out.println("5 is greater than 3");

}

if (null == null) {

System.out.println("null equals null");

}

if (new Object() == new Object()) {

System.out.println("Two object instances have different idententity");

}

甚至：if ((5 < 3) == false) {

System.out.println("The (logical) statement '5 is less than 3' is false. Therefore, the result of the boolean comparison is true and this code is executed");

}

總結(jié)

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