以下是一個範例，展示如何在Java 9介面中使用私有方法−
interface my_int{
public abstract void multiply_vals(int a, int b);
public default void add_vals(int a, int b){
sub_vals(a, b);
System.out.print("Default method result ");
System.out.println(a + b);
}
private void sub_vals(int a, int b){
System.out.print("Private method result ");
System.out.println(a - b);
}
private static void div(int a, int b){
System.out.print(" Private static method result ");
System.out.println(a / b);
}
}
public class my_new_int implements my_int{
@Override
public void multiply_vals(int a, int b){
System.out.print("Abstract method result ");
System.out.println(a * b);
}
public static void main(String[] args){
my_int in = new my_new_int();
in.multiply_vals(11, 34);
in.add_vals(78, 0);
}
}Abstract method result 374 Private method result 78 Default method result 78
An interface named 'my_int' is defined, that has an abstract function, without a body. Another 預設函數被定義為基本上將兩個數字相加。另一個名為‘sub_vals’的函數是 defined, which subtracts the two numbers.
Another static function named div is defined that divides the two values. A class named 'my_new_int' implements the previously defined interval. It overs the fface. In the main function, an instance of the interface is created, and the 'multiply_vals' function is called by passing specific values. Similarly, the 'add_vals' function is also) by passing specificon passing specificon 內容.
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