udemy java 8 course

This section explains the operator applicationThe Java calculation is divided into:Arithmetic operatorsOde value operatorlogical operatorsBitwise operatorsMeta operatorHere is a video explanation of the major types of operators, and there are exercises to provide youInterview questions:1. The most efficient way to figure out 2 times 8 equals a few?2. Swap the values of two integer variables (no third-party

This section mainly explains the application of operatorsThe Java operators are divided into:Arithmetic operatorsAssignment operatorslogical operatorsBitwise operatorsTernary operatorsHere is a video to explain the major types of operators, and there are exercises to provide everyoneInterview questions:1. The most efficient way to figure out 2 times 8 equals a few?2. Swap the values of two integer variables

variable: method zone static Zone member variable: heap memory C: Life cycle different static variable: Static variable is loaded with class and disappears with class Member variables: member variables exist as objects are created and disappear as the object disappears D: Call different static variables: You can call by object name, or you can call member variables through the class name: Only the object name is called (6) The main method is static public: Permissions Max static: No Call void w

inherited. (2) The final member variable represents a constant, which can only be assigned once, and the value will no longer change after the assignment. (3) Final cannot be used to modify the construction method.5.2 Final action on the method: If a class does not allow its subclasses to overwrite a method, you can declare this method as the final method. There are two reasons for using the final method: First, lock the method to prevent any inherited classes from modifying it

*/public void Closecon (Connection con) throws SQLException {if (con! = NULL) {Con.close ();}} /** * Gift,Delete, change * * @param SQL * @return * @throws SQLException */public boolean execute (String sql) throws SQLException {return stat Ement.execute (SQL);} /** * Query * * @param SQL * @return * @throws SQLException */public ResultSet query (String sql) throws SQLException {return Statement.executequery (SQL);}}Appconstants. Java (constant param

JAVA course 31st (Common Object API)-StringBuffer Class amp; StringBuilder class StringBuffer class The principle of string composition is implemented through this class StringBuffer can add or delete string content StringBuffer is a container Many methods are the same as strings. I. Features StringBuffer string buffer, used to store data in containers 1. Variable Length 2. Different data types can be st

1 PackageCom.xunhuan;2 3 Public classZuoYe004 {4 5 Public Static voidMain (string[] args) {6 intMen ;7 intwomen;8 intKids;9 //The number of men is less or equal to 10, on this basis the self-addedTen for(men=0;men){ One for(women=0;women//women are equal to 30 people. A if(30-men-women >= 0) {//If you use 30 total-men-the number of women results is greater than or equal to 0,

() { - +Color= "Blue"; System.out.println ("Sub class non-parametric construction"); - + } A at PublicSub (String c) { - -Color=c; System.out.println ("Sub class has a parameter structure"); - - } - in - PublicSub (Doubles,string c) { to + Super(s);//calling a constructor with a parameter in the base class - theColor=C; * $System.out.println ("Sub class has a parameter structure");Panax Notoginseng

internal masking details, external methods used to invoke, when to complete a function, we do not need to understand how this is implemented, just need to know to call this method to implement this function is goodTo illustrate:1 PackageCh11;2 3 /**4 * Student class, grammatical structure:5 * Public class class name {6 *//Properties7 * 8 * 9 *//MethodTen * } One * Created by Niechen on 17/5/13. A */ - classStudent { - /* the * syntax

1 PackageCom.xunhuan;2 3 Public classZuoYe003 {4 5 6 Public Static voidMain (string[] args) {7 8 for(inti = 1; i//Enter for Loop, (I=1 i9 if(i%3==0i%5==0) {//If judgment I take 3 no remainder, and I take more than 5 no remainder into if, the output is a multiple of 3 and 5TenSystem.out.println ("Filpflop"); One}Else if(i%3==0) {//does not satisfy if enter else if,i take-out 3==0, multiples of output 3 ASystem.out.println ("

1 PackageCom.xunhuan;2 3 Public classZUOYE02 {4 5 Public Static voidMain (string[] args) {6 intA = 0;7 intb = 1 ;8 Do {9 if(b%7==0) {//First Judge B is not the remainder, if there is no remainder proof is a multiple of 7TenA=a+b;//calculates the number of the other with a multiple of 7 One}b++; A} while(B//B is less than - System.out.println (a); - the } - -}