Three ways to convert java null to string

In Java development, processing null values ​​is a common task, especially when processing user input, database query results, or data returned by the API. Converting null values ​​to strings can avoid null pointer exceptions (NullPointerException) and make the code more robust. This article will introduce several ways to convert null values ​​to strings.

Using the ternary operator The ternary operator (?:) is a concise way to handle null values. If the variable is null, a default string is returned.

public class NullToStringExample {
    public static void main(String[] args) {
        String str = null;
        
        // Use ternary operator        String result = (str != null) ? str : "default value";
        
        // Output result        ("result: " + result);
    }
}

explain

(str != null) ? str : "Default value": If str is not null, then return str; otherwise, return default value.

Using the Method class provides a static method toString that can conveniently convert null values ​​to strings. If the object is null, a specified default string is returned.

How to use

The class provides a static method toString that conveniently converts null values ​​to strings. If the object is null, a specified default string is returned.

import ;

public class NullToStringExample {
    public static void main(String[] args) {
        String str = null;
        
        // Use Method        String result = (str, "default value");
        
        // Output result        ("result: " + result);
    }
}

Using the Method String class provides a static method valueOf that converts objects of various types into strings. If the object is null, the string "null" is returned.

public class NullToStringExample {
    public static void main(String[] args) {
        String str = null;
        
        // Use Method        String result = (str);
        
        // Output result        ("result: " + result);
    }
}

explain

(str): If str is not null, return the string representation of str; otherwise, return the string "null".

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