以下例子中哪些编译错误是存在的1 class FieldTest {2 private int num = 5;3 public int get() {4 return num;5 }6 }7 public class J_Class {8 public static void main(String[] args) {9 FieldTest ft = new FieldTest();10 int t = ft.get();11 int s=ft.num;12 System.out.println("t=" t);13 }14 }