binary maximum and minimum number limitation of int type in Java

Question

Why is the binary maximum and minimum number limitation shown as below:

//0 11111110 11111111111111111111111
int maxInt=0x7fffffff;

//0 00000001 00000000000000000000000
int minInt=0x80000000;

why is it not shown as below:

int maxInt=0xffffffff;

int minInt=0x00000000;