final vs static final in java

For final, it can be assigned different values at runtime when initialized. For example

Class Test{
  public final int a;
}
Test t1  = new Test();
t1.a = 10;
Test t2  = new Test();
t2.a = 20; //fixed

Thus each instance has different value of field a.

For static final, all instances share the same value, and can’t be altered after first initialized.

Class TestStatic{
      public static final int a;
}
Test t1  = new Test();
t1.a = 10;
Test t2  = new Test();
t1.a = 20;   // ERROR, CAN'T BE ALTERED AFTER THE FIRST INITIALIZATION.

private final static attribute vs private final attribute
Static vs Instance Variables: Difference?