Basic Java for Testers | Ch-3 | Decision making in Java

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Decision making in java with examples

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Decision making is a very commonly used concept in any programming language. It directs the compiler to choose either of the paths based on a condition for program execution.

We can make decisions in Java using either of two statements:

1. The If statement

If statement can be further used as:

(a) if-then statement

Example:

int iNumber1=10;

int iNumber2 = 20;

if (iNumber1+iNumber2<40)

{

System.out.println("Sum is less than forty");

}

(b) if-then-else & if-else_if-else

Example:

int iNumber1=10;

int iNumber2 = 20;

if (iNumber1+iNumber2<40)

{

System.out.println("Sum is less than forty");

}

else

{

System.out.println("Sum is greater than forty");

}

(c) if-else_if-else

Example:

int iNumber1=10;

int iNumber2 = 20;

if (iNumber1+iNumber2<40)

{

System.out.println("Sum is less than forty");

}

else if ((iNumber1+iNumber2>40))

{

System.out.println("Sum is greater than forty");

}

2. The Switch statement

The switch case comes handy In case you have multiple cases. The switch statement is multi-directional . It easily routes program execution to different parts of code based on expression's value.

Example:

public class SwitchExample {
    public static void main(String[] args) {
        int vowel = 4;
        String vowelString;
        switch (vowel) {
            case 1:  vowelString = "a";
                     break;
            case 2:  vowelString = "e";
                     break;
            case 3:  vowelString = "i";
                     break;
            case 4:  vowelString = "o";
                     break;
            case 5:  vowelString = "u";
                     break;
            default: vowelString = "Invalid vowel";
                     break;
        }
        System.out.println(vowelString);
//This will print vowel "o" as standard output!
    }
}

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