Java Tutorial: Generics in java | Java Generics [Generics Introduction] ~ foundjava

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Java Tutorial: Generics in java | Java Generics [Generics Introduction] 

Java Tutorial: Generics in java | Java Generics [Generics Introduction] 

NonGenericDemo.java

import java.util.ArrayList;

public class NonGenericDemo
{
    public static void main(String[] args)
    {
        ArrayList arrayList = new ArrayList();
        arrayList.add("Peter");
        arrayList.add(new Integer(10));
        System.out.println(arrayList);
        String stringValue = (String)arrayList.get(0);
        Integer integerValue = (Integer)arrayList.get(1);
        System.out.println("stringValue  = " +stringValue);
        System.out.println("integerValue = " +integerValue);
    }
}

Output

[Peter, 10]
stringValue  = Peter
integerValue = 10

GenericDemo.java

import java.util.ArrayList;

public class GenericDemo
{
    public static void main(String[] args)
    {
        ArrayList<String> arrayList = new ArrayList<String>();
        arrayList.add("Peter");
        arrayList.add("Ram");
        System.out.println(arrayList);
        String stringValue = arrayList.get(0);
        System.out.println("stringValue = " +stringValue);
    }
}

Output

[Peter, Ram]
stringValue = Peter

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