Web Reference: Feb 14, 2025 · However, when working with arrays and type casting, we sometimes encounter unexpected runtime exceptions. One such issue arises when we attempt to cast an Object [] array to a specific array type, such as Integer []. This results in a ClassCastException, which can confuse many of us. Oct 9, 2015 · You should rather declare the ArrayList as ArrayList menuComponents. Then you would have noticed, that in your method add(MenuComponent menuComponent) you are allways adding the arrayList to the arrayList, because you made a simple typo. It should be menuComponents.add(menuComponent); instead of menuComponents.add(menuComponents);. Jul 9, 2025 · Since Java supports polymorphism, it's possible for a reference variable of super type to hold object of sub type, but when we try to cast object, which is not exactly of type on left hand side, we get java.lang.ClassCastException. For example Casting String to ArrayList will result in ClassCastException in Java.
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