/**
* @author Hardneedl
*/
final class NumberDemo {
/**
* 过滤器
* @param <T> 待过滤的对象
*/
private interface Filter<T>{
boolean accept(T t);
}
public static void main(String... args) {
Filter<Integer> filter = (i) -> i >= 21 && i%21 == 0;
for (int i = 21 , j = 0; i <= 84; i++, j++) {
if(filter.accept(i)) {
System.out.printf("%3d\t", i);
}
}
}
}
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