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boolean found = false;
for (int i=0; i<a.length-1; i++) {
for (int j=i+1; j<a.length; j++) {
if (a[i] == a[j]) {
System.out.printf("第%d个和%d个相同,都是%d\n", i, j, a[i]);
found = true;
break;
}
}
if (found) {break;}
}