下列程序中注释的哪个代码(1、2、3、4)是错误的?
Abstract class Takecare {
protected void speakHello() {} //1
public abstract static void cry(); //2
static int f(){ return 0 ;} //3
abstract float g(); //4
}
选项:
A:
1
B:
2
C:
3
D:
4
Abstract class Takecare {
protected void speakHello() {} //1
public abstract static void cry(); //2
static int f(){ return 0 ;} //3
abstract float g(); //4
}
1
2
3
4
以下文字与答案无关
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abstract class A {
abstract float getFloat (); //1
void f() //2
{ }
}
public class B extends A {
private float m = 1.0f; //3
private float getFloat () //4
{ return m;
}
}
选项: A:1
B:2
C:3
D:4
import java.io.*;
public class E {
public static void main(String args]) {
int n=-1;
File f =new File("hello.txt");
byte ] a="abcd".getBytes();
try{ FileOutputStream out=new FileOutputStream(f);
out.write(a);
out.close();
FileInputStream in=new FileInputStream(f);
byte ] tom= new byte3];
int m = in.read(tom,0,3);
System.out.println(m); //【代码1】
String s=new String(tom,0,3);
System.out.println(s); //【代码2】
m = in.read(tom,0,3);
System.out.println(m); //【代码3】
s=new String(tom,0,3);
System.out.println(s); //【代码4】
}
catch(IOException e) {}
}
}(2.0分)
}
}
">14.(4)interface Com {
int add(int a, int b);
public static int get(int n){
return n;
}
public default int see(int n){
return n;
}
public default int look(int n){
return n;
}
}
class A implements Com{
public int add(int a, int b){
return a+b;
}
public int see(int n){
return n+1;
}
}
public class E {
public static void main(String args]){
A a = new A();
int m = a.add(12,6);
int n =Com.get(12);
int t = a.see(6);
int q = a.look(6);
System.out.printf("%d:%d:%d:%d",m,n,t,q);
}
}