```
public class Solution {
public int computeArea(int A, int B, int C, int D, int E, int F, int G, int H) {
int a1 = Math.abs((C-A)*(D-B));
int a2 = Math.abs((G-E)*(H-F));
if(E>=C||G<=A||D<=F||B>=H) return a1+a2;
else return a1+a2-(Math.min(C,G)-Math.max(A,E))*(Math.min(D,H)-Math.max(B,F));
}
}
```