| 4. 2. 1. if语句语法 |
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The if statement is a conditional branch statement.
The syntax of the if statement is either one of these two: |
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if (booleanExpression) {
statement (s)
}
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or |
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if (booleanExpression) {
statement (s)
} else {
statement (s)
}
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For example, in the following if statement, the if block will be executed if x is greater than 4. |
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public class MainClass {
public static void main(String[] args) {
int x = 9;
if (x > 4) {
// statements
}
}
}
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In the following example, the if block will be executed if a is greater than 3.
Otherwise, the else block will be executed. |
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public class MainClass {
public static void main(String[] args) {
int a = 3;
if (a > 3) {
// statements
} else {
// statements
}
}
}
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