java面向对象程序设计练习题 求解答

1、package nettest;

public class TestArray

{

int a[]={12,34,5,7,9,10};

public int max()

{

int j = a[1];

for(int i :a)

{

if(i > j)

{

j = i ;

}

}

return j;

}

public long avrage()

{

long j = 0l;

for(int i :a)

{

j = j + i;

}

return j/alength;

}

}

2、package nettest;

public class Person

{

String name;

int age;

Person(String name,int age)

{

thisname = name;

thisage = age;

}

public void printInfo()

{

Systemoutprintln("name = "+thisname+" age = "+thisage);

}

}

package nettest;

public class Student extends Person

{

String studentId;

Student(String name, int age)

{

super(name, age);

}

Student(String name, int age,String studentId)

{

super(name, age);

thisstudentId = studentId;

}

public void printInfo()

{

Systemoutprintln("name = "+thisname+" age = "+thisage+" StudentId =" + thisstudentId);

}

}

3、package nettest;

public class TestPrint

{

public static void main(String[] args)

{

for (int i = 1; i<10;i++)

{

for(int j = 0; j<i;j++)

{

Systemoutprint("");

}

Systemoutprintln();

}

}

}

public static void main(String[] args) {

Scanner input = new Scanner(Systemin);

Systemoutprintln("请个输入三个数:");

int num1 = inputnextInt();

int num2 = inputnextInt();

int num3 = inputnextInt();

int numMax = 0;

numMax = num1>num2num1:num2;

numMax = numMax>num3numMax:num3;

Systemoutprintln("三个数中最大的数字为："+numMax);

}

哈哈 我昨天刚做了这个作业 你够幸运

import javaawt;

import javaawtevent;

import javaxswing;

import javamath;

public class Homework10_3 {

public static void main(String args[]){

MathWindow win=new MathWindow();

}

}

class MathWindow extends JFrame{

JTextField text1,text2,text3;

JPanel ps,pn;

MathWindow(){

text1=new JTextField(10);

text2=new JTextField(10);

text3=new JTextField(10);

JButton button1,button2,button3,button4;

button1=new JButton("加");

button2=new JButton("减");

button3=new JButton("乘");

button4=new JButton("除");

ps=new JPanel();

pn=new JPanel();

pnadd(text1);

pnadd(text2);

pnadd(text3);

psadd(button1);

psadd(button2);

psadd(button3);

psadd(button4);

add(pn,BorderLayoutCENTER);

add(ps,BorderLayoutSOUTH);

setBounds(100,100,370,150);

setVisible(true);

validate();

button1addActionListener(new ActionListener(){

public void actionPerformed(ActionEvent e){

String s1=text1getText();

String s2=text2getText();

try{ BigInteger n1=new BigInteger(s1);

BigInteger n2=new BigInteger(s2);

n2=n1add(n2);

text3setText(n2toString());

}

catch(NumberFormatException ee){

text3setText("请输入数字字符");

text1setText(null);

text2setText(null);

}

}

});

button2addActionListener(new ActionListener(){

public void actionPerformed(ActionEvent e){

String s1=text1getText();

String s2=text2getText();

try{ BigInteger n1=new BigInteger(s1);

BigInteger n2=new BigInteger(s2);

n2=n1subtract(n2);

text3setText(n2toString());

}

catch(NumberFormatException ee){

text3setText("请输入数字字符");

text1setText(null);

text2setText(null);

}

}

});

button3addActionListener(new ActionListener(){

public void actionPerformed(ActionEvent e){

String s1=text1getText();

String s2=text2getText();

try{ BigInteger n1=new BigInteger(s1);

BigInteger n2=new BigInteger(s2);

n2=n1multiply(n2);

text3setText(n2toString());

}

catch(NumberFormatException ee){

text3setText("请输入数字字符");

text1setText(null);

text2setText(null);

}

}

});

button4addActionListener(new ActionListener(){

public void actionPerformed(ActionEvent e){

String s1=text1getText();

String s2=text2getText();

try{ BigInteger n1=new BigInteger(s1);

BigInteger n2=new BigInteger(s2);

if(n2toString()=="0"){

text3setText("除数不能为0");

}

else

{

n2=n1divide(n2);

text3setText(n2toString());

}

}

catch(NumberFormatException ee){

text3setText("请输入数字字符");

text1setText(null);

text2setText(null);

}

}

});

setDefaultCloseOperation(JFrameDISPOSE_ON_CLOSE);

}

}

1Object

2final

3Object

4this,super

一、读程序写结果

1100

2

数组a:123456,200,300

数组b:123456,200,300

数组b的长度: 3

3

a=10

b=30

c=60

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