Java Method isDefault() Method

The isDefault () method of Method class returns true if this method is a default method; returns false otherwise. A default method is a public non-abstract instance method, that is, a non-static method with a body, declared in an interface type.

Syntax

Parameter

No parameter is passed.

Returns

true if and only if this method is a default method as defined by the Java Language Specification.

Throw

Does not throw the exception.

Example 1

 //import statement
import java.lang.reflect.Method; 
import java.math.BigInteger; 
public class ReflectMethodisDefaultExample1   { 
  
    public static void main(String args[]) 
    { 
        try { 
            Class num = BigInteger.class; 
            Method[] mthd = num.getMethods(); 
            
             for (int i = 0; i < mthd.length; i++) {
      Method m = mthd[i];
      System.out.println(m.getName()+ " = " + m.isDefault()); //isDefault return true if this method is default method

    }
        } 
        catch (Exception e) { 
            e.printStackTrace(); 
        } 
    } 
}

Test it Now

Output:

run:
add = false
bitCount = false
equals = false
toString = false
toString = false
hashCode = false
abs = false
pow = false
min = false
max = false
compareTo = false
compareTo = false
intValue = false
longValue = false
floatValue = false
doubleValue = false
valueOf = false
signum = false
divide = false
remainder = false
shiftLeft = false
and = false
andNot = false
or = false
toByteArray = false
xor = false
bitLength = false
byteValueExact = false
clearBit = false
divideAndRemainder = false
flipBit = false
gcd = false
getLowestSetBit = false
intValueExact = false
isProbablePrime = false
longValueExact = false
mod = false
modInverse = false
modPow = false
multiply = false
negate = false
nextProbablePrime = false
not = false
probablePrime = false
setBit = false
shiftRight = false
shortValueExact = false
subtract = false
testBit = false
byteValue = false
shortValue = false
wait = false
wait = false
wait = false
getClass = false
notify = false
notifyAll = false
BUILD SUCCESSFUL (total time: 0 seconds)

Example 2

import java.lang.reflect.Method;

public class ReflectMethodisDefaultExample2 {
  public static void main(String[] args) {
    String nm = "java.util.Date";
    try {
      Class cls = Class.forName(nm);
      printMethods(cls);
    } catch (ClassNotFoundException e) {
      System.out.println("Class not found.");
    }
  }
  public static void printMethods(Class cls1) {
    Method[] mthd1 = cls1.getDeclaredMethods();

    for (int i = 0; i < mthd1.length; i++) {
      Method m = mthd1[i];
      System.out.println(m.getName()+ " = " + m.isDefault()); //isDefault return true if this method is default method

    }
  }
}

Test it Now

Output:

run:
equals = false
toString = false
hashCode = false
clone = false
compareTo = false
compareTo = false
readObject = false
writeObject = false
normalize = false
normalize = false
parse = false
after = false
before = false
from = false
getTime = false
setTime = false
getDate = false
UTC = false
convertToAbbr = false
getCalendarDate = false
getCalendarSystem = false
getCalendarSystem = false
getCalendarSystem = false
getDay = false
getHours = false
getJulianCalendar = false
getMillisOf = false
getMinutes = false
getMonth = false
getSeconds = false
getTimeImpl = false
getTimezoneOffset = false
getYear = false
setDate = false
setHours = false
setMinutes = false
setMonth = false
setSeconds = false
setYear = false
toGMTString = false
toInstant = false
toLocaleString = false
BUILD SUCCESSFUL (total time: 0 seconds)

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