import java.util.ArrayList;
import java.util.List;public class Single
{
private List<Integer> k = new ArrayList<Integer>();
private static Single instance = null; public void init()
{
k.add(10);
k.add(11);
k.add(12);
} public List<Integer> getList()
{
return k;
} private Single()
{ } public static Single getInstance()
{
if (instance == null)
{
instance = new Single();
}
return instance;
}
}
public class GetInstance
{
public static void main(String[] args)
{
Single.getInstance().init();
System.out.println(Single.getInstance().getList().size());
}
}
public class GetInstacne1
{
public static void main(String[] args)
{
System.out.println(Single.getInstance().getList().size());
}
}当GetInstance中初始化List后,为什么 getInstance1 中 取不到 List的值 ,对同一个对象的操作,怎么保存不了 List的值。。
跪求大神解惑~
javajavasejavaee
import java.util.List;public class Single
{
private List<Integer> k = new ArrayList<Integer>();
private static Single instance = null; public void init()
{
k.add(10);
k.add(11);
k.add(12);
} public List<Integer> getList()
{
return k;
} private Single()
{ } public static Single getInstance()
{
if (instance == null)
{
instance = new Single();
}
return instance;
}
}
public class GetInstance
{
public static void main(String[] args)
{
Single.getInstance().init();
System.out.println(Single.getInstance().getList().size());
}
}
public class GetInstacne1
{
public static void main(String[] args)
{
System.out.println(Single.getInstance().getList().size());
}
}当GetInstance中初始化List后,为什么 getInstance1 中 取不到 List的值 ,对同一个对象的操作,怎么保存不了 List的值。。
跪求大神解惑~
javajavasejavaee
一个程序只能有一个main入口
咋就取不到呢?
import java.util.ArrayList;
import java.util.List;
public class Single
{
private List<Integer> k = new ArrayList<Integer>();
private static Single instance = null;
public void init()
{
k.add(10);
k.add(11);
k.add(12);
}
public List<Integer> getList()
{
return k;
}
private Single()
{
}
public static Single getInstance()
{
if (instance == null)
{
instance = new Single();
}
return instance;
}
}
public class GetInstance
{
public static void main(String[] args)
{
Single.getInstance().init();
run1();
run2();
}
public void run1(){
System.out.println(Single.getInstance().getList().size());
}
public void run2(){
System.out.println(Single.getInstance().getList().size());
}
}