上机调试题：请说出E类中标注的【代码1】～【代码4】的输出结果。Import java.io.*;Public class E { pu

1.请说出E类中标注的【代码1】~【代码4】的输出结果。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 byte[3]; 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. 请说出E类中标注的【代码1】~【代码4】的输出结果____。(多个结果之间用#号隔开)。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) {}}}

4.请说出E类中标注的【代码1】~【代码4】的输出结果____。(多个结果之间用#号隔开)。
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) {}
}
}

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] （3）

String s = new String(tom,0,3);

System.out,println(s): //代码2]（abc）

m= in.read(tom,0,3);

System.out.println(m) //代码3] (1)

s =new String(tom,0,3)

System.out.println(s): //代码4] (abc)

catch(IOException e)(]

">5.请说出 E类中标注的代码 1]一代码4]的输出结果

import java.io.;public class E(public static void main(String args ]) (intn=-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] （3）

String s = new String(tom,0,3);

System.out,println(s): //代码2]（abc）

m= in.read(tom,0,3);

System.out.println(m) //代码3] (1)

s =new String(tom,0,3)

System.out.println(s): //代码4] (abc)

catch(IOException e)(]

Byte]a= "abcd" . getBytes();

Try{ FileOutputStream out = new FileOutputStream(f);

Out.write(a);

Out.close();

FileInputStream in = new FileInputStream(f);

Byte] tom= new byte 3];

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){}

}

">6.请说出E类中标注的【代码1】~【代码4】的输出结果。

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 byte 3];

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){}

}

7.

请说出E类中标注的【代码1.】~【代码4.】的输出结果()。(多个结果之间用#号隔开)。

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) {}

}

8.给出下列【代码】注释标注的代码的输出结果。class Tom {int weight = 10;void Tom(){weight = 18;}}public class E {public static void main(String args[]) {Tom cat = new Tom();System.out.println(cat.weight); //【代码】}}

9.请写出标注【代码】的输出结果。 public class Main { public static void main (String[]args) { String str = new String ("苹果"); modify(str); System.out.println(str); //【代码】 } public static void modify (String s) { s = s + "好吃"; } }

10.请说出E类中[代码1]和[代码2]的输出结果。 class A{ double f(int x, double y){ return x y; } int f(int x,int y) { return x*y; } } public class E{ public static void main(String args[ ] ){ A a=new A(); System.out.println(a.f(10,10)) ; // [代码1] System.out.println(a.f (10,10.0)) ; // [代码2] } }

11.下列代码的执行结果是( )。public class Test{public static void main(String args[]){String s1=new String(“Hello”);String s2=new String(“Hello”);System.out.println(s1==s2);System.out.println(s1.equals(s2));}}A、true falseB、true trueC、false trueD、false false

12.3．阅读程序（4）请说出E 类中【代码 1】和【代码 2】的输出结果。 class A { double f(int x,double y) { return x+y; } int f(int x,int y) { return x*y; } } public class E { public static void main(String args[]) { A a=new A(); System.out.println(a.f(10,10)); //【代码1】 System.out.println(a.f(10,10.0)); //【代码2】 } }

13.E类中【代码1】,【代码2】的输出结果分别是_______,_________。 class A { double f(int x,double y) { return x+y; } int f(int x,int y) { return x*y; } } public class E { public static void main(String args[]) { A a=new A(); System.out.println(a.f(10,10)); //【代码1】 System.out.println(a.f(10,10.0)); //【代码2】 } }

14.请说出E类中【代码1】和【代码2】的输出结果。 class A { double f(int x,double y) { return x+y; } int f(int x,int y) { return x*y; } } public class E { public static void main(String args[]) { A a=new A(); System.out.println(a.f(10,10)); //【代码1】 System.out.println(a.f(10,10.0)); //【代码2】 } }

15.下列代码的执行结果是( )。 public class Test{ public static void main String args[]){ String s1＝new String("welcome")； String s2=new String("welcome")； System．out．println(s1＝=s2)； System．out．println(s1．equals(s2))； } } A．false，falseB．false，trueC．true，trueD．true，false

16. 下列代码的执行结果是( )。public class Te{ public static void main(String args[]) { String s1 = new String("hello"); String s2 = new String("hello"); System.out.println(s1 == s2); System.out.println(s1.equals(s2)); }} 选项： A、 truefalse B、 truetrue C、 falsetrue D、 falsefalse

17.8.给出以下代码:class Base { void f(int i) {System.out.println("int"); } void f(double d) {System.out.println("double");} } public class Main extends Base { void f(String s) {System.out.println("String"); } void f(long i) {System.out.println(i); } public static void main(String argv]){ Main a = new Main(); a.f(10); } }程序运行后输出结果为:

18.请说出E类中【代码1】，【代码2】的输出结果。class A { double f(double x,double y) { return x-y; }}class B extends A { double f(int x,int y) { return x*y; }}public class E {public static void main(String args[]) { B b=new B(); System.out.println(b.f(3,5)); //【代码1】 System.out.println(b.f(3.0,5.0)); //【代码2】 }}

19.阅读程序，说出下列B类中【代码1】，【代码2】的输出结果。class A {public int getNumber(int a) {return a+1;}}class B extends A {public int getNumber (int a) {return a+100;}public static void main (String args[]) {A a =new A();System.out.println(a.getNumber(10)); //【代码1】a = new B();System.out.println(a.getNumber(10)); //【代码2】}}