public static void test1() {
happyTime(3, (day) ->System.out.println("今天是第" + day + "天"));
}
public static void happyTime(int day, Consumer consumer) {
consumer.accept(day);
}System.out.print("3-9=");
return 9;
});
}
public static void minus(int n, Supplier supplier) {
Integer t = (Integer) supplier.get();
System.out.println(n - t);
}public static void test3() {
String str = "123";
add(6, str, (s) ->Integer.parseInt(str));
}
public static void add(int n, String str, Function function) {
Integer t = (Integer) function.apply(str);
System.out.println(t + n);
}public static void test4() {
int n = -5;
guess(n, (number) ->{
if (n >0) return true;
return false;
});
}
public static void guess(int n, Predicate predicate) {
boolean isFlag = predicate.test(n);
System.out.println(isFlag);
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