What is the default value of boolean in java

The default value of boolean data type in Java is false. This is because all basic data types have a default value, and for boolean types, false is considered a reasonable default value because it is the more commonly used value in logical expressions. Uninitialized boolean variables will take the default value false. To set it to true explicitly, use the syntax: boolean flag = true.

The default value of boolean in Java

In Java, the default value of boolean data type is false.

Cause:

All basic data types in Java have a default value for initializing variables that are not explicitly assigned a value. For boolean types, the value of false is considered a reasonable default because it is the more commonly used value in logical expressions.

Example:

The following code example shows the default value of a boolean variable:

<code class="java">public class BooleanDefaultValue {
    public static void main(String[] args) {
        boolean flag; // 未初始化的 boolean 变量
        System.out.println(flag); // 输出 false
    }
}</code>

In the above example, the flag variable is not explicitly assigned a value, so It will take the default value false. When the program runs, the above code will output false.

Note:

• For other basic data types, the default value is:

  • Integer type (byte, short, int, long): 0
  • Floating point type (float, double): 0.0
  • Character type (char): '\u0000' (null character)
• If you want to explicitly set a boolean variable to true, you need to use the following syntax:

<code class="java">boolean flag = true;</code>

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