From 32a7d6ac4d0ded81fd1b50cf720d10e03994237d Mon Sep 17 00:00:00 2001 From: lzz19980125 Date: Sun, 12 Dec 2021 19:46:54 +0800 Subject: [PATCH] =?UTF-8?q?=E5=A2=9E=E5=8A=A0Discussion=E9=83=A8=E5=88=86?= MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit --- .idea/modules.xml | 1 + Lab/Lab.iml | 16 +++ Lab/src/Foo.java | 47 ++++++ Lab/src/IntList.java | 98 +++++++++++++ Lab/src/Lab2.java | 33 +++++ lecture/src/lecture2_2.java | 90 +++++++----- lecutre_2.md | 135 ++++++++++++++++++ out/production/Lab/Foo.class | Bin 0 -> 1744 bytes out/production/Lab/IntList.class | Bin 0 -> 2180 bytes out/production/Lab/Lab2.class | Bin 0 -> 562 bytes out/production/lecture/IntList.class | Bin 1085 -> 0 bytes out/production/lecture/SList$IntNode.class | Bin 458 -> 0 bytes out/production/lecture/SList.class | Bin 1545 -> 0 bytes out/production/lecture/lecture2_1.class | Bin 932 -> 0 bytes out/production/lecture/lecture2_2.class | Bin 832 -> 0 bytes out/production/lecture/lecture2_4.class | Bin 973 -> 0 bytes out/production/lecture_guide/IntNode.class | Bin 1108 -> 0 bytes .../lecture_guide/Lists1Exercises.class | Bin 1318 -> 0 bytes .../lecture_guide/SLList$IntNode.class | Bin 458 -> 0 bytes out/production/lecture_guide/SLList.class | Bin 2310 -> 0 bytes 20 files changed, 386 insertions(+), 34 deletions(-) create mode 100644 Lab/Lab.iml create mode 100644 Lab/src/Foo.java create mode 100644 Lab/src/IntList.java create mode 100644 Lab/src/Lab2.java create mode 100644 out/production/Lab/Foo.class create mode 100644 out/production/Lab/IntList.class create mode 100644 out/production/Lab/Lab2.class delete mode 100644 out/production/lecture/IntList.class delete mode 100644 out/production/lecture/SList$IntNode.class delete mode 100644 out/production/lecture/SList.class delete mode 100644 out/production/lecture/lecture2_1.class delete mode 100644 out/production/lecture/lecture2_2.class delete mode 100644 out/production/lecture/lecture2_4.class delete mode 100644 out/production/lecture_guide/IntNode.class delete mode 100644 out/production/lecture_guide/Lists1Exercises.class delete mode 100644 out/production/lecture_guide/SLList$IntNode.class delete mode 100644 out/production/lecture_guide/SLList.class diff --git a/.idea/modules.xml b/.idea/modules.xml index cc4f015..5080dff 100644 --- a/.idea/modules.xml +++ b/.idea/modules.xml @@ -2,6 +2,7 @@ + diff --git a/Lab/Lab.iml b/Lab/Lab.iml new file mode 100644 index 0000000..28ac7fd --- /dev/null +++ b/Lab/Lab.iml @@ -0,0 +1,16 @@ + + + + + + + + + + + + + + \ No newline at end of file diff --git a/Lab/src/Foo.java b/Lab/src/Foo.java new file mode 100644 index 0000000..37acaef --- /dev/null +++ b/Lab/src/Foo.java @@ -0,0 +1,47 @@ +/** + * @author Li Zezhong + * @create 2021-12-12 18:16 + */ + +public class Foo { + public int x, y; + public Foo (int x, int y) { + this.x = x; + this.y = y; + } + + public static void switcheroo (Foo a, Foo b) { + Foo temp = a; + a = b; + b = temp; + } + + public static void fliperoo (Foo a, Foo b) { + Foo temp = new Foo(a.x, a.y); + a.x = b.x; + a.y = b.y; + b.x = temp.x; + b.y = temp.y; + } + + public static void swaperoo (Foo a, Foo b) { + Foo temp = a; + a.x = b.x; + a.y = b.y; + b.x = temp.x; + b.y = temp.y; + } + + public static void main (String[] args) { + Foo foobar = new Foo(10, 20); + Foo baz = new Foo(30, 40); + switcheroo(foobar, baz); + System.out.println("foobar.x="+foobar.x+" foobar.y="+foobar.y+" baz.x="+baz.x+" baz.y="+baz.y); + System.out.println(); + fliperoo(foobar, baz); + System.out.println("foobar.x="+foobar.x+" foobar.y="+foobar.y+" baz.x="+baz.x+" baz.y="+baz.y); + System.out.println(); + swaperoo(foobar, baz); + System.out.println("foobar.x="+foobar.x+" foobar.y="+foobar.y+" baz.x="+baz.x+" baz.y="+baz.y); + } +} diff --git a/Lab/src/IntList.java b/Lab/src/IntList.java new file mode 100644 index 0000000..8392f1b --- /dev/null +++ b/Lab/src/IntList.java @@ -0,0 +1,98 @@ +/** + * @author Li Zezhong + * @create 2021-12-10 20:33 + */ + + +public class IntList{ + int first; + IntList rest; + public IntList(int f, IntList r){ + this.first = f; + this.rest = r; + } + public int size(){ + if(this.rest == null){ + return 1; + } + return 1+this.rest.size(); + } + public int IterativeSize(){ + IntList p; + int result=0; + p = this; + while(p !=null){ + result +=1; + p = p.rest; + } + return result; + } + public int get(int n){ + if(n==0){ + return this.first; + } + return this.rest.get(n-1); + } + public int IterativeGet(int n){ + IntList p=this; + while(n!=0){ + p = p.rest; + n -=1; + } + return p.first; + } + public void addFirst(int x){ + int y = first; + this.first = x; + this.rest = new IntList(y,null); + } + public static void print_List(IntList L){ + IntList n = L; + while(n !=null){ + System.out.println(n.first); + n = n.rest; + } + } + public static void dSquareList(IntList L){ + IntList p=L; + while(p!=null){ + p.first *= p.first; + p = p.rest; + } + } + public static IntList copy(IntList L){ + IntList p = new IntList(L.first,null); + IntList n = p; + IntList m = L; + while(m.rest!=null){ + m = m.rest; + p.rest = new IntList(m.first,null); + p = p.rest; + } + return n; + } + public static IntList squareListIterative(IntList L){ + IntList p = copy(L); + dSquareList(p); + return p; + } + public static IntList dcatenate(IntList A, IntList B){ + IntList p = A; + while(p.rest!=null){ + p = p.rest; + } + p.rest = B; + return A; + } + public static IntList catenate(IntList A, IntList B){ + IntList p = copy(A); + IntList m = p; + while(p.rest!=null){ + p = p.rest; + } + p.rest = B; + return m; + } +} + + diff --git a/Lab/src/Lab2.java b/Lab/src/Lab2.java new file mode 100644 index 0000000..1404fe2 --- /dev/null +++ b/Lab/src/Lab2.java @@ -0,0 +1,33 @@ +/** + * @author Li Zezhong + * @create 2021-12-10 20:34 + */ + + +public class Lab2 { + public static void main(String[] args) { + IntList list1 = new IntList(3,null); + list1.rest = new IntList(2,null); + list1.rest.rest = new IntList(1,null); + + IntList list2 = new IntList(6,null); + list2.rest = new IntList(5,null); + list2.rest.rest = new IntList(4,null); + +// IntList.print_List(list1); +// IntList.print_List(IntList.copy(list1)); +// IntList.dSquareList(list1); +// IntList.print_List(list1); +// IntList.print_List(IntList.squareListIterative(list1)); +// System.out.println(); +// IntList.print_List(list1); +// IntList.print_List(IntList.dcatenate(list1,list2)); +// IntList.print_List(IntList.catenate(list1,list2)); +// System.out.println(); +// IntList.print_List(list1); + + + } +} + + diff --git a/lecture/src/lecture2_2.java b/lecture/src/lecture2_2.java index 9b5793b..9b90c8b 100644 --- a/lecture/src/lecture2_2.java +++ b/lecture/src/lecture2_2.java @@ -8,52 +8,59 @@ /** Single List */ public class lecture2_2 { public static void main(String[] args) { - SList L = new SList<>(15); + SList L = new SList<>(63,15); L.addFirst(10); L.addFirst(5); - int x = L.getFirst(); - System.out.println(x); - System.out.println(L.size()); - L.addLast(1); - System.out.println(L.size()); - System.out.println(L.getLast()); - + L.positive_print(); + System.out.println(); + L.negative_print(); } } -class SList { - static class IntNode{ - public int item; +class SList { + class IntNode{ + public buber item; public IntNode next; + public IntNode prev; // public IntNode prev; - public IntNode(int i,IntNode n){ + public IntNode(buber i,IntNode n){ item = i; next = n; } + public IntNode(buber i,IntNode n,IntNode m){ + item = i; + next = n; + prev = m; + } } private IntNode sentinel; private int size; private IntNode last; - public SList(){ - sentinel = new IntNode(63,null); - last = sentinel.next; + public SList(buber intnode){ + sentinel = new IntNode(intnode,null,null); + last = sentinel; size = 0; } - public SList(int x){ - sentinel = new IntNode(63,null); - sentinel.next = new IntNode(x,null); - last = sentinel.next; + public SList(buber intnode,buber x){ + sentinel = new IntNode(intnode,null,null); + sentinel.next = new IntNode(x,null,sentinel); size = 1; + last = sentinel.next; } - public void addFirst(int y){ - sentinel.next = new IntNode(y,sentinel.next); + public void addFirst(buber y){ + sentinel.next = new IntNode(y,sentinel.next,sentinel); + if(sentinel.next.next!=null){ + sentinel.next.next.prev = sentinel.next; + } else{ + last = sentinel.next; + } size +=1; } - public int getFirst(){ + public buber getFirst(){ return sentinel.next.item; } - public int getLast(){ + public buber getLast(){ return last.item; } // public void addLast(int x){ @@ -64,23 +71,38 @@ public int getLast(){ // p.next = new IntNode(x,null); // size +=1; // } - public void addLast(int x){ - last.next = new IntNode(x,null); + public void addLast(buber x){ + last.next = new IntNode(x,null,last); last = last.next; size +=1; } - public static int size(IntNode p){ - if(p.next ==null){ - return 1; +// public static int size(IntNode p){ +// if(p.next ==null){ +// return 1; +// } +// return 1+size(p.next); +// } +// public int size(){ +// return size(sentinel.next); +// } + public int size(){ + return size; + } + public void positive_print(){ + IntNode p=sentinel.next; + while(p !=last){ + System.out.println(p.item); + p = p.next; } - return 1+size(p.next); + System.out.println(p.item); } - public int size(){ - return size(sentinel.next); + public void negative_print(){ + IntNode p=last; + while(p !=sentinel){ + System.out.println(p.item); + p = p.prev; + } } -// public int size(){ -// return size; -// } } diff --git a/lecutre_2.md b/lecutre_2.md index 6896894..d6248db 100644 --- a/lecutre_2.md +++ b/lecutre_2.md @@ -172,3 +172,138 @@ public int get(int i) { } ``` +# Discussion：pass-by-what + +```java +public class Pokemon { + public String name; + public int level; + public Pokemon(String name, int level) { + this.name = name; + this.level = level; + } + public static void main(String[] args) { + Pokemon p = new Pokemon("Pikachu", 17); + int level = 100; + change(p, level); + System.out.println("Name: " + p.name + ", Level: " + p.level); + } + public static void change(Pokemon poke, int level) { + poke.level = level; + level = 50; + poke = new Pokemon("Gengar", 1); + } +} +``` + +构建一个Pokemon.java的文件，最后的输出是： + +```java +Name: Pikachu, Level: 100 +``` + +原因如下：通过地址变量改变一个对象通常只有两种方法：（1）使用`.`操作符改变对象的属性 （2）使用Methods改变对象的属性，如果只是单纯的： + +```java +poke = new Pokemon("Gengar", 1); +``` + +则是将新对象Gengar的地址付给了poke，而旧的Pikachu地址将在函数中丢失，而并不是旧的Pikachu对象被替换为Gengar对象。 + +下面这一个Discussion的例子同样能够很好的说明上述问题： + +```java +public class Foo { + public int x, y; + public Foo (int x, int y) { + this.x = x; + this.y = y; + } + + public static void switcheroo (Foo a, Foo b) { + Foo temp = a; + a = b; + b = temp; + } + + public static void fliperoo (Foo a, Foo b) { + Foo temp = new Foo(a.x, a.y); + a.x = b.x; + a.y = b.y; + b.x = temp.x; + b.y = temp.y; + } + + public static void swaperoo (Foo a, Foo b) { + Foo temp = a; + a.x = b.x; + a.y = b.y; + b.x = temp.x; + b.y = temp.y; + } + + public static void main (String[] args) { + Foo foobar = new Foo(10, 20); + Foo baz = new Foo(30, 40); + switcheroo(foobar, baz); + System.out.println("foobar.x="+foobar.x+" foobar.y="+foobar.y+" baz.x="+baz.x+" baz.y="+baz.y); + System.out.println(); + fliperoo(foobar, baz); + System.out.println("foobar.x="+foobar.x+" foobar.y="+foobar.y+" baz.x="+baz.x+" baz.y="+baz.y); + System.out.println(); + swaperoo(foobar, baz); + System.out.println("foobar.x="+foobar.x+" foobar.y="+foobar.y+" baz.x="+baz.x+" baz.y="+baz.y); + } +} +``` + +程序输出为： + +```java +foobar.x=10 foobar.y=20 baz.x=30 baz.y=40 + +foobar.x=30 foobar.y=40 baz.x=10 baz.y=20 + +foobar.x=10 foobar.y=20 baz.x=10 baz.y=20 +``` + +# Discussion：静态方法强制改变类的属性 + +```java +public class Shock { + public static int bang; + public static Shock baby; + public Shock() { + this.bang = 100; + } + public Shock (int num) { + this.bang = num; + baby = starter(); + this.bang += num; + } + public static Shock starter() { + Shock gear = new Shock(); + return gear; + } + public static void shrink(Shock statik) { + statik.bang -= 1; + } + public static void main(String[] args) { + Shock gear = new Shock(200); + System.out.println(gear.bang); + shrink(gear); + shrink(starter()); + System.out.println(gear.bang); + } +} +``` + +上段程序的输出是： + +```java +300 +99 +``` + +这是由于在public Shock(int num)方法中存在starter()方法，而该方法是静态的，因此通过public Shock()方法强制将整个Shock类的bang属性重置为100，因此会有300的输出。 + diff --git a/out/production/Lab/Foo.class b/out/production/Lab/Foo.class new file mode 100644 index 0000000000000000000000000000000000000000..1642b0ef3356f0c5ac7de6b158287449375cca26 GIT binary patch literal 1744 zcmb7F>uwuG6#mAEy^h($Zth7#nvwi`Fx!EJ%M4K;NNC{<8}gfw=x$u{<`wYzR> z{zBh@*8uf`iqr?-Rd@%)cXpT9B~}HBcIM2PbNSA9&NzSk_3{;f3hrc(z=(lS6G@~L zau4)FU2bXTu>4iyfz=EYQdexp4z4MTb(Md1QIwKAx{LOeI_-!#oxYESflrrPl!M_58qU zGpXApteJWU)ppBYd$tqo1)inbl}T2$Y~mbN6z1Cc*s8itQwQJL!4V}t&`#hh%o7kH zMG?Yc>25oRl?+y~W?B^OK-rR4Pemfewp 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