id mainString args String s1reverseargs0 ifs1.equalsargs0 JOptionPane.showMessageDialognullargs0quot是回文串quot else JOptionPane.showMessageDialognullargs0quot不是回文串quot public static String reverseString s char s1new chars.length forint i0ilts.lengthi s1is.charAts.length-i-1 String Snew Strings1 return S ///8.14/public class LQ public static void mainString args int sum0 forint i0iltargs.lengthi sumInteger.parseIntargsi System.out.printlnsum public class LQ public static void mainString args int sum0 String sargs0.splitquotsquot forint i0ilts.lengthi sumInteger.parseIntsi System.out.printlnsum ///8.15/public class LQ public static void mainString args int sum0 forint i0iltargs0.lengthi ifCharacter.isUpperCaseargs0.charAti sum System.out.printlnsum ///8.17/public class LQ public static void mainString args String sJOptionPane.showInputDialogquot请输入字符串quot String s1s.splitquotWquot forint i0ilts1.lengthi System.out.printlns1i ///8.18/public class LQ public static void mainStringargs String sJOptionPane.showInputDialogquot请输入字符串quot String s1s.splitquotsquot double sum0 forint i0ilts1.lengthi sumDouble.parseDoubles1i JOptionPane.showMessageDialognullsum ///8.21/import java.io.import java.util.public class LQ public static void mainString argsthrows Exception java.io.File filenew java.io.FilequotExerise8_21.txtquot Scanner scnew Scannerfile double sum0.0 String s whilesc.hasNext ssc.next sumDouble.parseDoubles System.out.printlnsum ///8.22/import java.io.import java.util.public class LQ public static void mainString argsthrows Exception java.io.File filenew java.io.FilequotExerise8_22.txtquot PrintWriter outputnew PrintWriterfile forint i0ilt99i output.printintMath.random100quot quot output.close Scanner scnew Scannerfile int i0 intanew int100 String s whilesc.hasNext ssc.next aiInteger.parseInts i Arrays.sorta fori0ilt100i System.out.printaiquot quot ///9.1/public class GeometricObject private String colorquotwhitequot private boolean filled private java.util.Date dateCreated public GeometricObject dateCreatednew java.util.Date public String getColor return color public void setColorString color this.colorcolor public boolean isFilled return filled public void setFilledboolean filled this.filledfilled public java.util.Date getDateCreated return dateCreated public String toString return quotcreated on quotdateCreated quotncolor: quotcolorquot and filled: quotfilled //class Triangle extends GeometricObject private double side1 private double side2 private double side3 public Triangle side11 side21 side31 public Triangledouble side1double side2double side3 this.side1side1 this.side2side2 this.side3side3 public void getside System.out.printlnside1quot quotside2quot quotside3 public double getArea double sside1side2side3/2 sMath.sqrtss-side1s-side2s-side3 return s public double getPerimeter return side1side2side3 public String toString return quotTriangle:side1 quotside1quot side2 quotside2quot side3quotside3 public class LQ public static void mainString args GeometricObject Gnew Triangle11.51 G.setColorquotyellowquot G.setFilledtrue System.out.printlnG.getColor System.out.printlnG.isFilled System.out.printlnG.getDateCreated Triangle G.getside System.out.printlnTriangle G.getArea ///9.2/class Person private String name private String address private long number private String Eaddress public Person number0 void setnameString name this.namename String getname return name void setaddressString address this.addressaddress String getaddress return address void setnumberlong number this.numbernumber long getnumber return number void seteaddressString Eaddress this.EaddressEaddress String geteaddress return Eaddress public String toString return quotPerson quotquotname: quotnamequot adress: quotaddressquot number: quotnumberquotEaddress: quotEaddress class Student extends Person private String CLASS final String s1quotGrade 1quot final String s2quotGrade 2quot final String s3quotGrade 3quot final String s4quotGrade 4quot StudentString CLASS ifCLASS.charAt01this.CLASSs1 ifCLASS.charAt02this.CLASSs2 ifCLASS.charAt03this.CLASSs3 ifCLASS.charAt04this.CLASSs4 public String toString return quotStudent quotquotname: quotsuper.getnamequot adress:quotsuper.getaddressquot number: quotsuper.getnumberquot Eaddress:quotsuper.geteaddress class MyDate private int year private int mouth private int day MyDate Calendar cCalendar.getInstance yearc.getc.YEAR mouthc.getc.MONTH dayc.getc.DAY_OF_MONTH1 class Employee extends Person private String office private int charge //MyDate M Employee officequotquot void setofficeString office this.officeoffice void setchargeint charge this.chargecharge public String toString return quotEmployee quotquotname: .
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