BAEL-6332: Calling Non-Static Method In Static Method In Java (#13940)

core-java-modules/core-java-lang-oop-modifiers/src/main/java/com/baeldung/staticmodifier/Car.java

@@ -42,6 +42,10 @@ public class Car {
         this.engine = engine;
     }
 
+    public static String getCarsInformation(Car car) {
+        return car.getName() + "-" + car.getEngine();
+    }
+
     public static void setNumberOfCars(int numberOfCars) {
         Car.numberOfCars = numberOfCars;
     }

core-java-modules/core-java-lang-oop-modifiers/src/test/java/com/baeldung/staticmethod/CallNonStaticMethodUnitTest.java

@@ -0,0 +1,21 @@
+package com.baeldung.staticmethod;
+
+import static org.junit.Assert.assertEquals;
+
+import org.junit.AfterClass;
+import org.junit.Test;
+
+import com.baeldung.staticmodifier.Car;
+
+public class CallNonStaticMethodUnitTest {
+    @AfterClass
+    public static void setUpCarInstance() {
+        Car.setNumberOfCars(0);
+    }
+    @Test
+    public void whenCallingNonStaticMethodInStaticMethodWithInstanceClass_thenSuccess() {
+        Car car = new Car("Jaguar", "V8");
+        assertEquals("Jaguar-V8", Car.getCarsInformation(car));
+    }
+
+}

core-java-modules/core-java-lang-oop-modifiers/src/test/java/com/baeldung/staticmodifier/CarUnitTest.java

@@ -2,9 +2,16 @@ package com.baeldung.staticmodifier;
 
 import static org.junit.Assert.*;
 
+import org.junit.AfterClass;
 import org.junit.Test;
 
 public class CarUnitTest {
+
+    @AfterClass
+    public static void setUpCarInstance() {
+        Car.setNumberOfCars(0);
+    }
+
     @Test
     public void whenNumberOfCarObjectsInitialized_thenStaticCounterIncreases() {
         new Car("Jaguar", "V8");