Wykład 3 programy

  1. P10Tablice.java

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// P10Tablice.java

package p010tablice;

import java.util.*;

class Liczby

{

private int x=1,y=5;

public String toString()

{

String a = new String("(" + x + "," + y + ")");

return a;

}

}

public class P010Tablice

{

public static void main(String[] args)

{

int[] a;

int[] b = new int[5];

for(int i = 0; i<b.length; i++)

System.out.print("b[" + i + "]= " + b[i] + " ");

System.out.println();

for(int i = 0; i<b.length; i++)

b[i]=i*i;

for(int i = 0; i<b.length; i++)

System.out.print("b[" + i + "]= " + b[i] + " ");

System.out.println();

for(int element: b )

System.out.print("b = " + element + " ");

System.out.println();

Liczby[] c;

Liczby[] d = new Liczby[4];

for(int i = 0; i<d.length-1; i++)

{

d[i]=new Liczby();

System.out.print("d[" + i + "]= " + d[i]+ " ");

}

System.out.println();

for(int i =0; i<d.length; i++)

if(d[i] == null)

System.out.print("NIE ");

else

System.out.print("TAK ");

System.out.println();

for(Liczby element: d )

System.out.print("d = " + element + " ");

System.out.println();

Liczby[] e = {new Liczby(),new Liczby(),new Liczby()};

System.out.println("Rozmiar e = " + e.length);

for(int i = 0; i<e.length; i++)

System.out.println("e[" + i + "]= " + e[i] );

Liczby[] f;

f = new Liczby[]{new Liczby(), new Liczby()};

System.out.println("Rozmiar f = " + f.length);

for(int i = 0; i<f.length; i++)

System.out.println("f[" + i + "] = " + f[i]);

}

}

 

  1. P11Wewy.java

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// P11Wewy.java

package p11wewy;

import java.util.*;

import java.io.*;

public class P11Wewy

{

public static void main(String[] args) throws IOException

{

InputStreamReader we = new InputStreamReader(System.in);

BufferedReader in1 = new BufferedReader(we);

Locale pl = Locale.getDefault();

String s;

System.out.println("Podaj rozmiar tablicy: ");

s = in1.readLine();

System.out.println("String " + s);

System.out.println("Dlugosc tekstu= " + s.length());

Integer a = Integer.valueOf(s);

int aa = a.intValue();

System.out.println("Wprowadzone z stdin = " + aa);

// Od wersji 5

Scanner sc = new Scanner(System.in);

System.out.println("I jeszcz raz: ");

aa = sc.nextInt();

System.out.println("Druga wprowadzona = " + aa);

int[] b = new int[aa];

for(int i=0; i< b.length; i++)

{

b[i]= i*i;

System.out.println("b[" + i + "]= " + b[i]);

}

System.out.println("Czytanie z pliku " + args[0]);

BufferedReader in2 = new BufferedReader(new FileReader(args[0]));

Float c = Float.valueOf(in2.readLine());

float d = Float.parseFloat(in2.readLine());

/*

Locale.setDefault(Locale.US);

Scanner sc1 = new Scanner(new File(args[0]));

float c = sc1.nextFloat();

float d = sc1.nextFloat();

Locale.setDefault(pl);

*/

Formatter frt = new Formatter();

frt.format("c = %.3f | %15.5f = d",c,d);

System.out.println("Wczytane z pliku");

System.out.println(frt);

System.out.println("Pisanie do pliku " + args[1]);

PrintWriter out1 = new PrintWriter(

new BufferedWriter(new FileWriter( args[1])));

//frt = new Formatter();

frt.format(Locale.US, " c = %+.6f d = %-15.1e|\n",c,d);

out1.println(frt);

Calendar cld = Calendar.getInstance();

out1.format("Czas %1$tY %1$tB %1$tA %1$tr",cld);

System.out.format("Czas %1$tY %1$tB %1$tA %1$tr\n",cld);

Locale.setDefault(Locale.US);

System.out.format("Czas %1$tY %1$tB %1$tA %1$tr\n",cld);

Locale.setDefault(pl);

out1.close();

}

}

  1. P13Tablice.java

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// P13Tablice.java

package p13tablice;

import java.util.*;

import java.io.*;

public class P13Tablice

{

public static void main(String[] args)

{

int[] a1 = {25,25,25};

int[] a2 = new int[3];

Arrays.fill(a2,25);

for(int i=0; i< a2.length;i++)

System.out.println("a1 " + a1[i] + " a2 " + a2[i]);

System.out.println("Arrays " + Arrays.equals(a1,a2));

System.out.println("Zwykla " + a1.equals(a2));

Integer[] a3 = {new Integer(25),new Integer(25),new Integer(25)};

Integer[] a4 = new Integer[3];

Arrays.fill(a4,new Integer(25));

System.out.println("Arrays " + Arrays.equals(a3,a4));

System.out.println("Zwykla " + a3.equals(a4));

String[] a5 = {"ala","ala","ala"};

String[] a6 = new String[3];

Arrays.fill(a6,"ala");

System.out.println("Arrays " + Arrays.equals(a5,a6));

System.out.println("Zwykla " + a5.equals(a6));

int[] a7 = {15,3,5,16,8,4,5,9,25,45,2};

Arrays.sort(a7);

for(int i=0; i< a7.length;i++)

System.out.print(a7[i]+" ");

System.out.println();

String[] a8 =

{"gosia","ala","tola","ula","zosia","basia","kasia","maciek"};

Arrays.sort(a8);

for(int i=0; i<a8.length;i++)

System.out.print(a8[i]+" ");

System.out.println();

Para[] a9={new Para(2,"ala"),new Para(1,"ola"),new Para(3,"ela")};

for(int i=0; i< a9.length; i++) System.out.print(a9[i]+" " );

System.out.println();

Arrays.sort(a9, new PorownajInt());

for(int i=0; i< a9.length; i++) System.out.print(a9[i]+" ");

System.out.println();

Arrays.sort(a9, new PorownajString());

for(int i=0; i< a9.length; i++) System.out.print(a9[i]+" ");

System.out.println();

Para aa = new Para(2,"ala"), bb=new Para(3,"tola");

PorownajInt xxx = new PorownajInt();

int k = xxx.compare(aa,bb);

System.out.println("k="+k);

}

}

class Para

{

private int x;

private String y;

Para(int a,String b){x=a;y=b;}

public int dajInt(){return x;}

public String dajString(){return y;}

public String toString() { return x + "," + y ;}

}

class PorownajInt implements Comparator<Para>

{

public int compare(Para a, Para b)

{

int aa = a.dajInt();

int bb = b.dajInt();

return aa == bb ? 0 : ( aa < bb ? -1 : 1);

}

}

class PorownajString implements Comparator<Para>

{

public int compare(Para a, Para b)

{

String aa = a.dajString();

String bb = b.dajString();

return aa.compareTo(bb);

}

}

// przed wersją 5

//class PorownajInt implements Comparator {

//public int compare(Object a, Object b){

//int aa = ((Para)a).dajInt();

//int bb = ((Para)b).dajInt();

//return aa == bb ? 0 : ( aa < bb ? -1 : 1);

//}

//}

//class PorownajString implements Comparator{

//public int compare(Object a, Object b){

//String aa = ((Para)a).dajString();

//String bb = ((Para)b).dajString();

//return aa.compareTo(bb);

//}

  1. P14Tablice.java

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// P14Tablice

package p14tablice;

import java.util.Arrays;

class TablicaDrukuj

{

static void drukuj(String[][] x, String opis)

{

int n = x.length;

System.out.println("String " + opis);

for (int i = 0; i < n; i++)

{

for (int j = 0; j < x[i].length; j++)

{

System.out.print(x[i][j] + " ");

}

System.out.println();

}

}

static void drukuj(int[][] x, String opis)

{

int n = x.length;

System.out.println("int " + opis);

for (int i = 0; i < n; i++)

{

for (int j = 0; j < x[i].length; j++)

{

System.out.print(x[i][j] + " ");

}

System.out.println();

}

}

static void drukuj(DwieFloat[][] x, String opis)

{

int n = x.length;

System.out.println("DwieFloat " + opis);

for (int i = 0; i < n; i++)

{

for (int j = 0; j < x[i].length; j++)

{

System.out.print(x[i][j] + " ");

}

System.out.println();

}

}

static void drukuj(float[][] x, String opis)

{

int n = x.length;

System.out.println("float " + opis);

for (int i = 0; i < n; i++)

{

for (int j = 0; j < x[i].length; j++)

{

System.out.print(x[i][j] + " ");

}

System.out.println();

}

}

}

class DwieFloat

{

private float x, y;

DwieFloat(float a, float b)

{

x = a;

y = b;

}

float dodajDwie()

{

return x + y;

}

float odejmijDwie()

{

return x - y;

}

@Override

public String toString()

{

return "(" + x + "," + y + ")";

}

}

public class P14Tablice

{

public static void main(String[] args)

{

int[][] a1 = new int[3][4];

TablicaDrukuj.drukuj(a1, "a1");

int[][] a2 = {{1, 2, 3}, {4, 5, 6}, {7, 8, 9}, {10, 11, 12}};

TablicaDrukuj.drukuj(a2, "a2");

int[][] a22 = {{1, 2, 3}, {4, 5, 6}, {7, 8, 9}, {10, 11, 12}};

TablicaDrukuj.drukuj(a22, "a22");

System.out.println("a2 == a22? => " + Arrays.equals(a2, a22));

for (int i = 0; i < a22.length; i++)

{

System.out.println("a2[" + i + "]== a22[" + i + "]? => "

+ Arrays.equals(a2[i], a22[i]));

}

a22[2][0] = 0;

TablicaDrukuj.drukuj(a22, "a22");

for (int i = 0; i < a22.length; i++)

{

System.out.println("a2[" + i + "]== a22[" + i + "]? => "

+ Arrays.equals(a2[i], a22[i]));

}

int[][] a3 = new int[3][4];

Arrays.fill(a3[0], 1);

Arrays.fill(a3[1], 2);

Arrays.fill(a3[2], 3);

TablicaDrukuj.drukuj(a3, "a3");

String[][] a4 =

{

{"ala", "bel", "cal"},

{"dil", "ela", "fel"}

};

TablicaDrukuj.drukuj(a4, "a4");

DwieFloat[][] a5 =

{

{new DwieFloat(1f, 2f), new DwieFloat(3f, 4f)},

{new DwieFloat(5f, 6f), new DwieFloat(7f, 8f)},

{new DwieFloat(9f, 10f), new DwieFloat(11f, 12f)}

};

TablicaDrukuj.drukuj(a5, "a5");

float[][] a51 = new float[a5.length][a5[0].length];

for (int i = 0; i < a51.length; i++)

{

for (int j = 0; j < a51[i].length; j++)

{

a51[i][j] = a5[i][j].dodajDwie();

}

}

TablicaDrukuj.drukuj(a51, "a51");

int[][] a6 = new int[5][];

for (int i = 0; i < a6.length; i++)

{

a6[i] = new int[i + 1];

}

TablicaDrukuj.drukuj(a6, "a6");

Integer[][] a7 = {{1, 2, 3}, {4, 5, 6}, {7, 8, 9}, {10, 11, 12}};

ParametrTablicePisz.pisz(a4, "a4 <String>");

ParametrTablicePisz.pisz(a5, "a5 <DwieFloat>");

ParametrTablicePisz.pisz(a7, "a7 <Integer>");

}

}

class ParametrTablicePisz

{

static <Tablica> void pisz(Tablica[][] x, String opis)

{

int n = x.length;

System.out.println("Tablica " + opis);

for (int i = 0; i < n; i++)

{

for (int j = 0; j < x[i].length; j++)

{

System.out.print(x[i][j] + " ");

}

System.out.println();

}

}

}

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