Difference between local and class member variables

Here is a self explanatory example:

package sample_java_package_1;

public class SampleClass_1 {

    int i = 1;

    public static void main(String[] args) {

        SampleClass_1 obj1 = new SampleClass_1();
        SampleClass_1 obj2 = new SampleClass_1();
        SampleClass_1 obj3 = new SampleClass_1();
        obj1.i = 5;
        obj2.i = 6;
        int a = obj1.i;
        int b = obj2.i;
        System.out.println(a);
        System.out.println(b);
        System.out.println(obj3.i);
    }

}