public String toString() {}方法

新建一个javabean:

public class AdminUser {
private Integer uid;
private String username;

private String password;

//getter(）和setter()方法

@Override
public String toString() {
return " username=" + username
+ ", password=" + password ;

}

在action中调用这个javabean，

AdminUser adminUser  = new AdminUser( ); 

adminUser.setUsername(rs.getString("username"));

adminUser.setPassword(rs.getString("password"));

list.add(adminUser);
if(list != null && list.size()>0){

    System.out.println("查询成功！"+list.get(0)); }

如果不加这个方法，输出就会变为：www.wan.tcp.entity.AdminUser@308d4560