Java中成員辦法與成員變量拜訪權限詳解。本站提示廣大學習愛好者：（Java中成員辦法與成員變量拜訪權限詳解）文章只能為提供參考，不一定能成為您想要的結果。以下是Java中成員辦法與成員變量拜訪權限詳解正文
本身編寫SqlHelper，年夜家參考應用吧
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Data;
using System.Windows.Documents;
using System.Windows.Input;
using System.Windows.Media;
using System.Windows.Media.Imaging;
using System.Windows.Navigation;
using System.Windows.Shapes;
using System.Data; using System.Data.SqlClient;
namespace SqlHelper
{
/// <summary>
/// Window1.xaml 的交互邏輯
/// </summary>
public partial class Window1 : Window
{
public Window1()
{
InitializeComponent();
}
//只用來履行查詢成果比擬少的sql
private void btnds_Click(object sender, RoutedEventArgs e)
{
SqlHelper.ExecuteNonQurey("insert into T_Student(Name,Age) values('張三',55)",
new SqlParameter[0]);
MessageBox.Show("添加勝利");
}
private void btnDataSet_Click(object sender, RoutedEventArgs e)
{
DataSet ds= SqlHelper.ExecuteDataSet("select * from T_Student where hobbit='@hobbit'",
new SqlParameter[]{new SqlParameter("'@hobbit'","哈哈哈")});
foreach(DataRow row in ds.Tables[0].Rows)
{
string name = (string)row["Name"];
MessageBox.Show(name);
}
}
}
}
;
System.out.println( ch.i3 );//i3可以在B中拜訪
System.out.println( ch.i4 );
*/
/*5 Chengyuan ch = new Chengyuan();//其余包其余類有繼續關系Chengyuan extends D
System.out.println( ch.i1 );
System.out.println( ch.i2 );//i2在D中不是公共的;沒法從內部法式包中對其停止拜訪
System.out.println( ch.i3 );//i3可以在D中拜訪private
System.out.println( ch.i4 );
*/
//======================================================
//二 成員辦法的拜訪權限
/*1 Chengyuan ch = new Chengyuan();//本身包本身類
System.out.println( ch.m1() );
System.out.println( ch.m2() );
System.out.println( ch.m3() );
System.out.println( ch.m4() );
*/
/*2 B b = new B();//本身包其余類
System.out.println( b.m1() );
System.out.println( b.m2() );
System.out.println( b.m3() );//m3()可以在B中拜訪private
System.out.println( b.m4() );
*/
/*3 E e = new E();//其余包 其余類
System.out.println( e.m1() );
System.out.println( e.m2() );//m2在E中不是公共的;沒法從內部法式包中對其停止拜訪
System.out.println( e.m3() );//m3可以在E中拜訪private
System.out.println( e.m4() ); //m4()可以在E中拜訪protected
*/
/*4 C c = new C();//本身包其余類有繼續關系Chengyuan extends C
System.out.println( c.m1() );
System.out.println( c.m2() );
System.out.println( c.m3() );//m3()可以在C中拜訪
System.out.println( c.m4() );
*/
//5
Chengyuan ch = new Chengyuan();
System.out.println( ch.m1() );
System.out.println( ch.m2() );//找不到符號
System.out.println( ch.m3() );//找不到符號
System.out.println( ch.m4() );
}
}
class B{
//1 成員變量
public int i1 = 100;
int i2 = 200;
private int i3 = 300;
protected int i4 = 400;
//2 成員辦法
public int m1(){return 1;}
int m2(){return 1;}
private int m3(){return 1;}
protected int m4(){return 1;}
}
class C{
//1 成員變量
public int i1 = 100;
int i2 = 200;
private int i3 = 300;
protected int i4 = 400;
//2 成員辦法
public int m1(){return 1;}
int m2(){return 1;}
private int m3(){return 1;}
protected int m4(){return 1;}
}
//========================================================
//D.class文件和E.class文件在cn包內,為了便利把他們放到這裡
package cn.jaovo;
public class D{
//1 成員變量
public int i1 = 100;
int i2 = 200;
private int i3 = 300;
protected int i4 = 400;
//2 成員辦法
public int m1(){return 1;}
int m2(){return 1;}
private int m3(){return 1;}
protected int m4(){return 1;}
}
//-------
package cn.jaovo;
public class E{
//1 成員變量
public int i1 = 100;
int i2 = 200;
private int i3 = 300;
protected int i4 = 400;
//2 成員辦法
public int m1(){return 1;}
int m2(){return 1;}
private int m3(){return 1;}
protected int m4(){return 1;}
}
以上代碼是Java中成員辦法與成員變量拜訪權限詳解，願望年夜家愛好。
