战狼2结尾彩蛋:请教Java高手帮忙！！！！

4。public class TestArray
{
public static void main(String [] args)
{
int a[]=null;
a[0]=1;
System.out.println(a[0]);
}
}
5.public class TestArray
{
public static void main(String [] args)
{
int a[]=null;
a[0]=1;
System.out.println(a[0]);
}
}
6.class Construct
{
int age;
public Construct(int x)
{
age=x;
}
}
class TestConstruct
{
public static void main(String [] args)
{
Construct c=new Construct();
System.out.print(age);
}
}
7.class Person
{
private Person()
{
System.out.println("the constructor 1 is calling!");
}
private int age=10;
public void shout()
{
System.out.println("age is"+age);
}
}
class TestPerson
{
public static void main(String [] agrs)
{
Person p1=new Person();
p1.shout();
Person p2=new Person();
p2.shout();
Person p3=new Person();
p3.shout();
}
}
8.class Chinese
{
static void sing();
{
system.out.println("啊!")
}
void singOurCountry()
{
sing()
}
}
class TestChinese
{
public static void main(String [] args)
{
Chinese.sing();
Chinese ch1=new Chinese();
ch1.sing();
ch1.singOurCountry();
}
}

填空并写出结果：
1.class Person
{
String name;
int age;
Person(String a,int b)
{
name=a;
age=b;
}
}

public class ResumeDemo
{
public static void main(String args[ ])
{
Person sun=new Person("孙亮",21);
System.out.println("姓名："+_______);
System.out.println("年龄："+_______);
}
}
2.class Value
{ public int x,y;
Value(int a,int b)
{ x=a;
y=b;
}
}
public class AddDemo
{ public static void main(String args[ ])
{ int t;
Value num=____ _____(23,56);
t=num.x+num.y;
System.out.println("add="+t);
}
}
3. import java.io.*;
class MethodOverloading{
void receive(int i){
System.out.println("receive one int data");
System.out.println("i="+i);}
void receive(int x,int y)
{System.out.println("receive two int data");
System.out.println("x="+x+" y="+y);
}
}
public class Test{
public static void main(String args[]){
MethodOverloading mo=new MethodOverloading();
mo._______(1);
mo._______(2,3);
}
}