FULL PRODUCT VERSION :
java version "1.7.0_04"
Java(TM) SE Runtime Environment (build 1.7.0_04-b22)
Java HotSpot(TM) 64-Bit Server VM (build 23.0-b21, mixed mode)

ADDITIONAL OS VERSION INFORMATION :
Windows 7 Ultimate 64 bits SP1

A DESCRIPTION OF THE PROBLEM :
The access attributes affected the results of the operation.

The results of the below code printed:
i = 3
j = 4

==================================================
public class outer {
    public int i = 1;
    private int j = 1;
   
    public static void main(String[] args) {
        new outer().new inner().Test();
    }
    
    class inner {
        public void Test() {
            i+=i+=1;
            j+=j+=1;

            System.out.println("i = " + i);
            System.out.println("j = " + j);
        }
    }
}

STEPS TO FOLLOW TO REPRODUCE THE PROBLEM :
If the access attributes of the i and j are public, the results are 3
If the access attributes of the i and j are private, the results are 4
If the access attributes of the i and j are public and private respectively, the results are 3 and 4

EXPECTED VERSUS ACTUAL BEHAVIOR :
EXPECTED -
The expected result:
i = 3
j = 3
ACTUAL -
The actual results:
i = 3
j = 4

REPRODUCIBILITY :
This bug can be reproduced always.

---------- BEGIN SOURCE ----------
public class outer {
    public int i = 1;
    private int j = 1;
   
    public static void main(String[] args) {
        new outer().new inner().Test();
    }
    
    class inner {
        public void Test() {
            i+=i+=1;
            j+=j+=1;

            System.out.println("i = " + i);
            System.out.println("j = " + j);
        }
    }
}
---------- END SOURCE ----------

SUPPORT :
YES