Java復(fù)習(xí)題閱讀程序題

JAVA程序設(shè)計(jì)復(fù)習(xí)題之（三）閱讀程序題（通信工程專業(yè)使用）三、閱讀程序題。1、閱讀以下程序：public class Sum public static void main( String args) double sum = 0.0 ; for ( int i = 1; i= 100; i + ) sum += i;, System.out.println( sum= + sum ); 該程序完成的功能是： 求sum=1+2+3+.+100的和。2、閱讀以下程序：public class Sum public static void main(String args) double sum = 0.0：for (int i=1; i=100; i+)sum += i*i；System.out.println( sum=+sum); 該程序的功能是： 求出sum的值為1到100的平方和。3、閱讀以下程序：public class Sum public static void main(String args) double sum = 0.0；for(int i = 1; i = 100; i+)sum += i*i*i;System.out.println(sum= + sum); 此程序完成的功能是： 計(jì)算并輸出1到100的立方和sum值。4、閱讀以下程序：public class Sum public static void main(String args) double sum = 0.0；for (int i=1; i=100; i+) sum += 1.0 / (double)i;System.out.println(sum=+sum); 此程序完成的功能是： 求解sum=1+1/2+1/3+.+1/100的值并打印輸出。5、閱讀以下程序import java.io.* ;public class Test public static void main(String args ) int i, s = 0;int a = 10, 20, 30, 40, 50, 60, 70, 80, 90;for ( i = 0 ; i a.length; i+ )if(ai % 3 = 0) s += ai;System.out.println(s= + s);請(qǐng)寫出此程序的輸出結(jié)果： s=1806、閱讀以下程序 import java.io.*;public class abc public static void main(String args ) AB s = new AB(Great!,I love Eclipse.); System.out.println(s.toString( ); class AB String s1; String s2; public AB(String str1, String str2) s1 = str1; s2 = str2; public String toString( ) return s1 + s2;運(yùn)行結(jié)果是： 運(yùn)行結(jié)果是：Great! I love Eclipse.7、閱讀以下程序import java.io.* ; public class abc public static void main(String args ) int i, s = 0 ; int a = 10 , 20 , 30 , 40 , 50 , 60 , 70 , 80 , 90 ; for ( i = 0 ; i a.length ; i + ) if ( ai%3 = = 0 ) s += ai ; System.out.println(s=+s); 運(yùn)行結(jié)果是： 運(yùn)行結(jié)果：s = 1808、閱讀以下程序import java.io.* ; public class abc public static void main(String args ) System.out.println(a= + a + nb= + b); class SubClass extends SuperClass int c; SubClass(int aa, int bb, int cc) super(aa, bb); c = cc; class SubSubClass extends SubClass int a; SubSubClass(int aa, int bb, int cc) super(aa, bb, cc); A = aa + bb + cc; void show( )System.out.println(a=+a+nb=+b+nc=+c); 運(yùn)行結(jié)果是： 運(yùn)行結(jié)果：a=60b=20c=309、以下程序的輸出結(jié)果為 相等 。class StringTest1 public static void main(String args) String s1=hello;String s2=new String(hello);if( s1.equals(s2) ) System.out.println(相等);else System.out.println(不相等);10、以下程序段的輸出結(jié)果為 5 6 7 8 9 。public class TestArray public static void main(String args ) int i , j ;int a = 5,9,6,8,7; for ( i = 0 ; i a.length-1; i + ) int k = i; for ( j = i ; j a.length; j+ ) if ( aj ak ) k = j; int temp = ai; ai = ak; ak = temp; for ( i =0 ; ia.length; i+ ) System.out.print(ai+ ); System.out.println( ); 11、寫出以下程序的功能。import java.io.*;public class TestFile public static void main(String args) throws Exception BufferedReader br = new BufferedReader(new InputStreamReader(System.in); BufferedWriter bw = new BufferedWriter(new FileWriter(“input.txt); String s; while (true) System.out.print(請(qǐng)輸入一個(gè)字符串： ); System.out.flush( ); s = br.readLine( ); if (s.length() = 0) break; bw.write(s); bw.newLine(); bw.close( ); 程序功能是： 程序功能是：從鍵盤逐一輸入字符串，逐一輸出至input.txt文件中，直至輸入空行。12、閱讀以下程序，寫出輸出結(jié)果。class Animal Animal( ) System.out.print (Animal ); public class Dog extends Animal Dog( ) System.out.print (Dog ); public static void main(String args) Dog snoppy = new Dog(); 輸出結(jié)果是： 輸出結(jié)果是：Animal Dog13、以下程序的輸出結(jié)果為 Peter is 17 years old! 。public class Person String name;int age;public Person(String name, int age) = name;this.age = age;public static void main(String args) Person c = new Person(Peter, 17);System.out.println( + is + c.age + years old!);14、以下程序的輸出結(jié)果為_ 課程號(hào):101 課程名:JSP 學(xué)分:3 _。public class Course private String cNumber;private String cName;private int cUnit;public Course(String number, String name, int unit) cNumber = number;cName = name;cUnit = unit;public void printCourseInfo() System.out.println(課程號(hào): + cNumber + 課程名: + cName + 學(xué)分: + cUnit);class CourseTest public static void main(String args) Course c;c = new Course(101, JSP, 3);c.printCourseInfo();15、以下程序的輸出結(jié)果為_ 湯姆貓?bào)w重：20.0斤 _。public class Tom private float weight;private static String name;public void setWeight(float weight) this.weight = weight;private void out() System.out.println(name + 體重： + weight + 斤);public static void main(String args) T = 湯姆貓;Tom cat = new Tom();cat.setWeight(20);cat.out();16、以下程序的輸出結(jié)果是 _姓名:Tom 年齡:15 家庭住址:宿城區(qū) 電話:66123456 學(xué)校：宿中_。public class Father String name, address, tel;int age;public Father(String name, int age) = name;this.age = age;void out() System.out.print(姓名: + name);System.out.print( 年齡: + age);void outOther() System.out.print( 家庭住址: + address);System.out.print( 電話: + tel);class Son extends Father String school;public Son(String name, int age) super(name, age);void out() super.out();super.outOther();System.out.println( 學(xué)校： + school);public static void main(String args) Son son = new Son(Tom, 15);son.address = 宿城區(qū);son.school = 宿中;son.tel = 66123456;son.out();17、下列程序的運(yùn)行結(jié)果是_ 12345_。public class MyClass int a = 1, 2, 3, 4, 5 ;void out() for (int j = 0; j a.length; j+)System.out.print(aj + );public static void main(String args) MyClass my = new MyClass();my.out();18、閱讀下面的程序，回答問題。import java.awt.*; import javax.swing.*; public class T extends JFrame public T ( ) super(GridLayout); Container con=this.getContentPane(); con.setLayout(new GridLayout(2,3); con.add(new JButton(a); con.add(new JButton(b); con.add(new JButton(c); con.add(new JButton(d); con.add(new JButton(e); con.add(new JButton(f); setSize(200, 80); setVisible(true); public static void main(String args) new T(); 畫圖表示程序運(yùn)行后的圖形界面。如果程序通過實(shí)現(xiàn)某個(gè)接口處理按鈕的動(dòng)作事件，則該接口名為何？接口中的方法頭聲明如何？答案：接口名：ActionListener 接口中的方法：public void actionPerformed(ActionEvent e)19、閱讀下面的程序，并回答問題。import java.io.*;public class Test public static void main(String args) throws IOException BufferedReader buf=new BufferedReader( new InputStreamReader(System.in); while (true) String str = buf.readLine( ); if( str.equals(quit) ) break; int x = Integer.parseInt(str); System.out.println(x*x); 編譯運(yùn)行上面的程序：從鍵盤輸入5，回車后輸出的結(jié)果如何？從鍵盤輸入quit，回車后程序執(zhí)行情況如何？答案：25 終止應(yīng)用程序的運(yùn)行。20、閱讀下面的程序代碼，并回答問題。String s1 = new String(abcde);String s2 = new String(abcde); boolean b1= s1.equals(s2);boolean b2 = s1= s2; System.out.print(b1+ +b2); 程序段執(zhí)行后，在命令行的輸出結(jié)果如何？解釋輸出(1)的結(jié)果的原因？答案： true falseequals方法比較兩個(gè)字符串的內(nèi)容是否相等；運(yùn)算符“=”判斷兩個(gè)對(duì)象是否指向同一個(gè)引用，即是否為同一個(gè)對(duì)象。21、閱讀下面的程序，并回答問題。import java.io.*;public class Test public static void main(String args) throws IOException BufferedReader buf=new BufferedReader( new InputStreamReader(System.in); while (true) String str = buf.readLine(); if( str.equals(quit) ) break; int x = Integer.parseInt(str); System.out.println(x*x); 編譯運(yùn)行上面的程序：從鍵盤輸入10，回車后輸出的結(jié)果如何？從鍵盤輸入exit，回車后程序能正確執(zhí)行嗎？為什么？答案：100 不能；因?yàn)榉椒↖nteger.parseInt(str)不能將字符串“exit”轉(zhuǎn)化為整數(shù)，拋出異常。22、寫出下面的程序編譯、運(yùn)行后的結(jié)果。public class Test public static void main(String args) new Student(Tom, m, 90, 88); new Student(Jack, m, 66, 89); new Student(Mary, f, 76, 86); System.out.println(nametsextchinesetenglish); Student.print(); class Student protected String name; protected char sex; protected int chinese; protected int english; protected Student next; static Student list; Student (String name, char sex, int chinese, int english) =name; this.sex=sex; this.chinese=chinese; this.english=english; this.next=list; list=this; static void print() Student friend=list; if (friend=null) System.out.println(The list is empty.); else do System.out.println(friend.toString(); friend=friend.next; while(friend!=null); public String toString() return new String(name+t+sex+t+chinese+t+english); 答案：name sex chinese englishMary f 76 86Jack m 66 89Tom m 90 8823、閱讀下列程序：public class Sumpublic static void main(String args)int j=10;System.out.println(j is : +j);calculate(j);System.out.println(At l