fundamentals of microelectronics

path, but pass a OutputStream object?A: The reason is simple, the byte buffer stream only provides buffers, designed for efficiency. However, the actual read and write operation is also dependent on the basic flow object implementation.3. Bufferedoutputstream Write Data , code example:1 Packagecn.itcast_05;2 3 ImportJava.io.BufferedOutputStream;4 ImportJava.io.FileOutputStream;5 Importjava.io.IOException;6 7 Public classBufferedoutputstreamdemo {8 Public Static voidMain (string[] args)th

1. FileInputStream reading data One byte array at a time byte[]Use FileInputStream to read one byte array at a time:int read (byte[] b)　　return value : The return value is actually the number of bytes actually read.2. code example:1 PackageCom.himi.fileinputstream;2 3 ImportJava.io.FileInputStream;4 Importjava.io.IOException;5 6 7 8 /**9 * Ten * Use FileInputStream one byte array at a time: int read (byte[] b) One * Return value: The return value is actually the number of bytes actually read A

1. Requirements: Copy the D:\\english.mp4 to the current project directory Copy.mp4code example:1 Packagecom.himi.filecopy;2 3 ImportJava.io.FileInputStream;4 ImportJava.io.FileOutputStream;5 Importjava.io.IOException;6 7 /**8 * 9 * Requirements: Copy the D:\\english.mp4 to the current project directory Copy.mp4Ten * One */ A Public classCOPYMP4 { - - Public Static voidMain (string[] args)throwsIOException { the //Data Source -FileInputStream FIS =NewFileInputStream ("D:\\engl

development use when we are developing, we will see abstract classes, or interfaces as parameters. And this time, we know that what is actually needed is a subclass object. If the method is called only once, we can use the format of the anonymous inner class to simplify. Interface Person {public abstract void study (); } class Persondemo {public void method (person p) {p.study (); }} class Persontest {public static void main (string[] args) {Persondemo

numbers C: Get the maximum value in three numbers (nesting of If statements) D: According to the score output corresponding to the class E: According to the month, the output corresponding to the season F: According to the x to calculate the corresponding Y value and output (4) Ternary operator F statement the second format of the relationship all ternary operators can be implemented, the if statement of the second format can be achieved. Conversely, it is not established. If the statement bod

is as follows:1 Packagecn.itcast_03;2 3 ImportJava.io.FileWriter;4 Importjava.io.IOException;5 ImportJava.io.PrintWriter;6 7 /*8 * 1: Any type of data can be manipulated. 9 * PRINT ()Ten * println () One * 2: Start auto Refresh A * PrintWriter pw = new PrintWriter (New FileWriter ("Pw2.txt"), true); - * or you should call the println () method to - * This time not only automatically refreshed , but also to achieve the data line-breaking . the * - * println () - * actually equivalent to :

[] args)throwsIOException { - //Encapsulating Data Sources -BufferedReader br =NewBufferedReader (NewFileReader ("B.txt")); - // Encapsulate Destination (Create collection Object) -arraylistNewArraylist(); - in //read data stored in the collection -String line =NULL; to while(line = Br.readline ())! =NULL) { + Array.add (line); - } the * //Freeing Resources $ br.close ();Panax Notoginseng - //iterating through the collection the

{ + //Encapsulating Data Sources -InputStreamReader ISR =NewInputStreamReader (NewFileInputStream ( +"A.txt")); A //Package Destination atOutputStreamWriter OSW =NewOutputStreamWriter (NewFileOutputStream ( -"B.txt")); - - //Read and write Data - //Mode 1 - //int ch = 0; in //While ((ch = isr.read ())! =-1) { - //osw.write (CH); to // } + - //Mode 2 the Char[] CHS =New Char[1024]; * intLen = 0; $

Mylinenumberreadertest, as follows:1 Packagecn.itcast_09;2 3 ImportJava.io.FileReader;4 Importjava.io.IOException;5 6 Public classMylinenumberreadertest {7 Public Static voidMain (string[] args)throwsIOException {8 //Mylinenumberreader MLNR = new Mylinenumberreader (New FileReader (9 //"My.txt"));Ten OneMyLineNumberReader2 MLNR =NewMyLineNumberReader2 (NewFileReader ( A"My.txt")); - - //Mlnr.setlinenumber (ten); the - //System.out.println (Mlnr.getlinen

[] array name; B: Data type array name []; Recommendation is a way, B method forget it. But to be able to read (4) Initialization of an array A: Dynamic initialization gives only the length, the system gives the default value example: int[] arr = new INT[3]; B: Static initialization of the given value, the system determines the length example: int[] arr = new int[]{1,2,3}; Simplified version: int[] arr = {£ º}; (5) Java memory allocation

, the cost is greatly reduced, and reduce the occurrence of bugs2) decomposition of the processFor example, to make a steamed bread, his steps are: face, seasoning, cooking and other steps, each step we can be defined as a function, and then do a steamed bread is required to function is the one-way, and so on, each small step to execute the correct rate is higher than the overall operation.In summary, this section notes why you need to write a function, mainly because it provides efficiency and

Switch statements in Java:Here expression control expressions can only have data types of byte, short, char, int four integer types and enumeration types, and cannot be of type Boolean;Java7 (1.7) improved the Switch Branch statement;Java7 allows the control expression in the switch statement to be of type java.lang.String ( cannot be stringbuffer or StringBuilder)Switch (expression){Case Condition1:{statement (s);Break}Case Condition2:{statement (s);Break}Case Condition3:{statement (s);Break}..

(); atSystem.out.println ("sub.filed =" + Sub.field + -", Sub.getfield () =" + Sub.getfield () + -", Sub.getsuperfield () =" +Sub.getsuperfield ()); - } -}Output:sup.filed = 0, Sup.getfield () = 1sub.filed = 1, Sub.getfield () = 1, Sub.getsuperfield () = 0Analysis:The sub subclass actually contains two fields called field, whereas the default domain generated when referencing field in sub is not a super version of the Field field, so in order to get Super.field, you must explicitly indicate

= List.iterator ();//While (It.hasnext ()) {//string str = (string) it.next ();//if (str.equals ("Polo")) {//List.add ("Pony");// }// }Listiterator listit=List.listiterator (); while(Listit.hasnext ()) {String str=(String) listit.next (); if(Str.equals ("Polo") {Listit.add ("Pony"); } if(Str.equals ("Shery") {Listit.add ("Keity"); }} System.out.println (list); for(inti = 0; I ){ if(List.get (i). Equals ("Polo")) {List.add ("Pony"); } i

After the transformation, began to enter the learning time, the following is the collation of learning notes C # and Java some differences between1, = = and equalsIn C #, the comparison of strings can be = = to compare, but in java use = = has always been false, originally in Java = = is used to see whether two references to the same memory address, equals is the value of the comparison object is equal, the total known string is the reference type of the2, switch the differenceIn C #, after the

Public StaticDate stringtodate (string s, string format) the throwsParseException { + return NewSimpleDateFormat (format). Parse (s); - } $}2. Dateutildemo. Java, as follows:1 Packagecn.itcast_04;2 3 Importjava.text.ParseException;4 Importjava.util.Date;5 6 /*7 * Test of Tool class8 */9 Public classDateutildemo {Ten Public Static voidMain (string[] args)throwsParseException { OneDate d =NewDate (); A //YYYY-MM-DD HH:mm:ss -String s = dateutil.datetos

1. The origin of the collection:We are learning object-oriented language, and object-oriented language is the description of things through objects, in order to facilitate the operation of multiple objects, we have to store these multiple objects. To store multiple objects, you cannot be a basic variable, but rather a variable of a container type, what are the container types in the knowledge we have learned? Arrays and StringBuffer. But what? The result of StringBuffer is a string that does not

(' A ')); -System.out.println ("isdigit:" + character.isdigit (' a ')); -System.out.println ("isdigit:" + character.isdigit (' 0 '))); -System.out.println ("-----------------------------------------"); - //Public Static char touppercase (char ch): Converts the given character to uppercase characters -System.out.println ("toUpperCase:" + character.touppercase (' A ')); inSystem.out.println ("toUpperCase:" + character.touppercase (' a ')); -System.out.println ("---------------------------

multiplicand) A * Public BigDecimal Divide (BigDecimal divisor) - * Public BigDecimal Divide (BigDecimal divisor,int scale,int roundingmode): quotient, several decimals, how to take out - */ the Public classBigdecimaldemo { - Public Static voidMain (string[] args) { - //System.out.println (0.09 + 0.01); - //System.out.println (1.0-0.32); + //System.out.println (1.015 *); - //System.out.println (1.301/100); + ABigDecimal BD1 =NewBigDecimal ("0.09"); atBigD

long - * Float float - * Double double the * Char Character - * Boolean boolean - * - * Used for conversions between basic data types and strings. + */ - Public classIntegerdemo { + Public Static voidMain (string[] args) { A //No, the trouble is coming. at //Public static String tobinarystring (int i) -System.out.println (integer.tobinarystring (100)); - //Public static String tooctalstring (int i) -System.out.println (integer.tooctalstring (100)); -