CODEWITHSUNDEEP
javakotlinintellij-ideamigrationoverriding
Pavel Bukhalov
Pavel Bukhalov

Reputation: 73

How to override function in Kotlin object?

I have some problems with mirgating my application from Java to Kotlin. I have this class in java, which works great:

public final class BooleanUtils extends org.apache.commons.lang3.BooleanUtils {

    private BooleanUtils() {
    }

    /**
     * Converts a String to Boolean.
     * @param str  the String to check
     * @return true/false
     */
    public static boolean toBoolean(final String str) {
        return org.apache.commons.lang3.BooleanUtils.toBoolean(str) || "1".equals(str);
    }

}

and after auto-transform in IntelijiIdea, it began to look like this

import org.apache.commons.lang3.BooleanUtils

object BooleanUtils : BooleanUtils() {
    
    /**
     * Converts a String to Boolean.
     * @param str  the String to check
     * @return true/false
     */
    fun toBoolean(str: String): Boolean {
        return BooleanUtils.toBoolean(str) || "1" == str
    }
}

But compiler tells me, that

Accidental override: The following declarations have the same JVM signature (toBoolean(Ljava/lang/String;)Z): fun toBoolean(p0: String?): Boolean defined in my.util.BooleanUtils fun toBoolean(str: String?): Boolean defined in my.util.BooleanUtils

How could I override fun toBoolean(str: String), to make it work like in Java?

Upvotes: 0

Views: 1169

Answers (1)

duffymo
duffymo

Reputation: 308763

I'd prefer an extension to the String class:

fun String.boolean(): Boolean = 
    return when(this.toLowerCase()) {
        "y", "yes", "t", "true", "1" -> true
        else -> false
    }

Upvotes: 1

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