Convert string to boolean using java's Boolean.valueOf() function

Use Java's Boolean.valueOf() function to convert a string into a Boolean value

In Java programming, you often encounter situations where you need to convert a string into a Boolean value. Java provides a convenient way to achieve this requirement, using the Boolean.valueOf() function. This function can convert a Boolean value represented by a string into the corresponding Boolean type.

Let’s learn more about the usage of Boolean.valueOf(). Given a string, we can convert it to a Boolean value by calling Boolean.valueOf(). The specific code is as follows:

public class BooleanValueOfExample {
    public static void main(String[] args) {
        String str = "true";
        boolean b = Boolean.valueOf(str);
        System.out.println(b); // 输出 true
    }
}

In the above example, we pass the string "true" as a parameter to the Boolean.valueOf() function, and assign the converted Boolean value to the variable b. Finally, we print out the value of variable b, and we can see that the output result is true.

It should be noted that the Boolean.valueOf() function will return true for the string "true" (case-insensitive), and will return false for any other string (including "false"). This is because a Boolean value has only two possible values, true and false. Any string other than this will return false when converted to a boolean value.

In addition, the Boolean.valueOf() function can also accept other types of parameters, such as characters, numbers, etc. For these parameters, the function will convert according to certain rules. For example, the following example demonstrates how to convert the character '1' to a Boolean value:

public class CharacterExample {
    public static void main(String[] args) {
        char c = '1';
        boolean b = Boolean.valueOf(c);
        System.out.println(b); // 输出 true
    }
}

In the above example, we directly pass the character '1' as a parameter to the Boolean.valueOf() function, and Assign the converted Boolean value to variable b. Finally, we print out the value of variable b, and we can see that the output result is true.

It should be noted that this conversion method only applies to the characters '1' and '0'. For other characters, a NumberFormatException will be thrown.

To sum up, using Java's Boolean.valueOf() function can easily convert a string into a Boolean value. Whether you want to convert a "true" string to true, or convert any character to a Boolean value, you can use this function to achieve it. At the same time, when using this function, you need to pay attention to the legality of the parameters to avoid exceptions.

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