java安卓接口怎么写 _接口

1.java 接口怎么写,求教,本人小白接口A.java
public interface A {
public void TestA();
}
接口B.java
public interface B {
public void TestB();
}
测试父类TestPare.java
public class TestPare {
private String str = "父类"；
【java安卓接口怎么写】public String getStr() {
return str;
}
public void setStr(String str) {
this.str = str;
}
}
测试类Test.java
public class Test extends TestPare implements A,B{
String str = "";
public String getStr() {
return str;
}
public void setStr(String str) {
this.str = str;
}
@Override
public void TestB() {
// TODO Auto-generated method stub
System.out.println（"接口B的实现"）；
}
@Override
public void TestA() {
// TODO Auto-generated method stub
System.out.println（"接口A的实现"）；
}
}
2.这个JAVA接口该怎么写,求教public class A implements YoutrInterface {
@Override
public Object returndata(String selestr, String seleitem) {
Object object = null;
try {
Class.forName("Your Driver class path");
Connection conn = DriverManager.getConnection("Your db url", "username", "password");
PreparedStatement ps = conn.preparedStatement(selestr);
ResultSet rs = ps.executeQuery();
while (rs.next()) {
object = rs.getObejct(seleitem);
}
ps.close();
conn.close();
} catch (ClassNotFoundException e) {
e.printStackTrace();
} catch (SQLException e) {
e.printStackTrace();
}
return object;
}
}
按照你说的应该是一个精确查询，结果只有一个；如果返回结果有多个，接口应该写为Listreturndata(String selestr, String seleitem);

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