head first java 4th edition

2.5.1 sorting all sorts of data· Trading Services· Pointer sort· Immutable keys· Cheap Exchange.· Multiple sorting methods· Multi-key Array· Using the comparator to implement a priority queue· Stability: Ability to preserve the relative position of repeating elements in an arrayStabilize: Insert Sort, merge sortInstability: Select Sort, Hill sort, quick sort, heap sort2.5.2 What sort algorithm should I use1. Fast sorting is the fastest general-purpose sorting algorithm.2. Sort the raw type data:

BooleanLess (comparable V, comparable W) {returnV.compareto (W) ; } Private Static voidExch (comparable[] A,intIintj) {comparable T=A[i]; A[i]=A[j]; A[J]=T; } Private Static voidShow (comparable[] a) {//to print an array in a single line for(inti = 0; i ) Stdout.print (A[i]+ " "); Stdout.println (); } Public Static Booleanissorted (comparable[] a) {//test array elements for order for(inti = 1; i ) if(Less (A[i], a[i-1]))return false; return true; } Pu

binary trees;Another important extension is the composite data structure: We can use the Backpack storage stack, the queue to store arrays and so on, for example, we can use an array of backpacks to represent it.It's easy to define arbitrarily complex data structures in this way, and one of the important reasons we focus on abstract data types is trying to control this complexity.3. When researching a new application area, we will follow the steps below to identify the target and use the data a

effects;the value of the macro:Functions (such as GETCHAR) are defined as macros to avoid the overhead of calling functions, and #undef names can be used to cancel macro definitions; The formal parameter in the name cannot be replaced with a quoted string and, if necessary, precede the parameter with # in the replacement text;preprocessing operator # #: If the replacement text in the shape participates in it adjacent, then the parameter is replaced by the actual parameter # #及其前后空白符会被删除, the re

programming languages is the Lisp language invented by McCathy in the the 1950s, and the linked list is the main structure of the program and data in this language.9. The implementation of the backpack:You only need to rename the push () in the stack to add () and remove the implementation of the pop ().ImportJava.util.Iterator; Public classBagImplementsIterable { PrivateNode first;//The first node of a linked list Private intN; Private classNode {Item item; Node Next; } Public Boo

sufficient to save all the elements, without wasting too much space:If there is no extra space, we will double the length of the array;If the stack size is less than One-fourth of the array, we will halve the length of the array.In this implementation, the stack never overflows, and the usage is never less than One-fourth (unless the stack is empty, in which case the array size is 1).The textbook has the source code, fully understand!5. Even if the use case no longer requires this element, the

does not initiate assertions, and you can use the-enableassertions flag (abbreviated as-EA) at the command line to start the assertion. The purpose of the assertion is to debug: The program should not rely on assertions in normal operations, as they may be disabled. The system programming course learns to use assertions to ensure that the code is never terminated by a system error or into a dead loop. （？ ）10. If you always complain about the nature of programming language, then you can only des

exception.4. Familiarize yourself with the typical array processing code (P11-P12):· Find the largest element in an array· Computes the average of an array element· Copying an array· Reverse the order of array elements· Matrix multiplication (Phalanx)-a[][] * b[][] = c[][]5. The array name represents the entire array-if we assign an array variable to another variable, then two variables will point to the same array. If you want to copy an array, you should declare, create, and initialize a new

than This.4. A backpack is a collection data type that does not support removing elements from it-its purpose is to help the use case to collect elements and iterate through all the collected elements (use cases can also check whether the backpack is empty or get the number of elements in the backpack).Using bag can indicate that the order in which elements are processed is Unimportant.5. A classic reason to use a stack iterator in an application is to reverse their relative order while preserv

Summary: As the name implies.Focus:1. Geometric objects: A Natural example of object-oriented programming is designing data types for geometric objects.Point2d.java is a data type for points in the plane.Interval1d.java is a data type for one-dimensional intervals.Interval2d.java is a data type for two-dimensional intervals.Interested to study!2. The Java language provides special support for string initialization and connection: We can create and ini

){ switch(action){ case Action.STOP: out.println("bofangtingzhidonghua"); break; case Action.RIGHT: out.println("bofangxiangyoudonghua"); break; case Action.LEFT: out.println("bofangxiangzuodonghua"); break; case Action.UP: out.println("bofangxiangshangdonghua"); break; case Action.DOWN: out.println("bofangxiangxiadonghua"); break; default: out.println("buzhichicidongzuo");

Java is based on C + +, but Java is a more purely object-oriented programming language, unlike C + +, Java only supports object-oriented programming, so Java programming style is also pure OOP style, that is, everything is a class, everything is done in the class object.In Java