в 17:43, 31 мая 2010

2010-05-31T17:43:48Z

Admin: 1 версия

2010-05-31T14:11:59Z

1 версия

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== new Scanner(FileReader file) ==



<source lang="java">

/**
*Output:
String: Testing
String: Scanner
int: 10
double: 12.2
String: one
boolean: true
String: two
boolean: false
*/
import java.io.FileReader;
import java.io.FileWriter;
import java.io.IOException;
import java.util.Scanner;
public class MainClass {
public static void main(String args[]) throws IOException {
int i;
double d;
boolean b;
String str;
FileWriter fout = new FileWriter("test.txt");
fout.write("Testing Scanner 10 12.2 one true two false");
fout.close();
FileReader fin = new FileReader("Test.txt");
Scanner src = new Scanner(fin);
while (src.hasNext()) {
if (src.hasNextInt()) {
i = src.nextInt();
System.out.println("int: " + i);
} else if (src.hasNextDouble()) {
d = src.nextDouble();
System.out.println("double: " + d);
} else if (src.hasNextBoolean()) {
b = src.nextBoolean();
System.out.println("boolean: " + b);
} else {
str = src.next();
System.out.println("String: " + str);
}
}
fin.close();
}
}

</source>



== new Scanner(InputStream source) ==



<source lang="java">

/**
*Output:
*/
import java.util.Scanner;
public class MainClass {
public static void main(String args[]) {
Scanner conin = new Scanner(System.in);
int count = 0;
double sum = 0.0;
System.out.println("Enter numbers to average.");
while (conin.hasNext()) {
if (conin.hasNextDouble()) {
sum += conin.nextDouble();
count++;
} else {
String str = conin.next();
if (str.equals("done"))
break;
else {
System.out.println("Data format error.");
return;
}
}
}
System.out.println("Average is " + sum / count);
}
}

</source>



== new Scanner(Readable source) ==



<source lang="java">

/*
*/
import java.io.FileReader;
import java.io.FileWriter;
import java.io.IOException;
import java.util.Scanner;
public class MainClass {
public static void main(String args[]) throws IOException {
int count = 0;
double sum = 0.0;

FileWriter fout = new FileWriter("test.txt");

fout.write("2, 3.4, 5,6, 7.4, 9.1, 10.5, done");
fout.close();

FileReader fin = new FileReader("Test.txt");

Scanner src = new Scanner(fin);

src.useDelimiter(", *");

while(src.hasNext()) {
if(src.hasNextDouble()) {
sum += src.nextDouble();
count++;
}
else {
String str = src.next();
if(str.equals("done")) break;
else {
System.out.println("File format error.");
return;
}
}
}

fin.close();
System.out.println("Average is " + sum / count);
}
}

</source>



== new Scanner(String instr) ==



<source lang="java">

/**
*Output:
28
*/
import java.util.Scanner;
public class MainClass {
public static void main(String args[]) {
String instr = "Name: Joe Age: 28 ID: 77";
Scanner conin = new Scanner(instr);
conin.findInLine("Age:"); // find Age
if (conin.hasNext())
System.out.println(conin.next());
else
System.out.println("Error!");
}
}

</source>



== Scanner: findInLine(String str) ==



<source lang="java">

/**
*Output:
28
*/
import java.util.Scanner;
public class MainClass {
public static void main(String args[]) {
String instr = "Name: Joe Age: 28 ID: 77";
Scanner conin = new Scanner(instr);
conin.findInLine("Age:"); // find Age
if (conin.hasNext())
System.out.println(conin.next());
else
System.out.println("Error!");
}
}

</source>



== Scanner: findWithinHorizon(String pattern, int horizon) ==



<source lang="java">

import java.util.Scanner;
public class Main {
public static void main(String args[]) {
Scanner sc = new Scanner("Name: Tom Age: 28 ID: 77");
sc.findWithinHorizon("ID:",100);
if (sc.hasNext())
System.out.println(sc.next());
else
System.out.println("Error!");
}
}

</source>



== Scanner: hasNext() ==



<source lang="java">

/**
*Output:
*/
import java.util.Scanner;
public class MainClass {
public static void main(String args[]) {
Scanner conin = new Scanner(System.in);
int count = 0;
double sum = 0.0;
System.out.println("Enter numbers to average.");
while (conin.hasNext()) {
if (conin.hasNextDouble()) {
sum += conin.nextDouble();
count++;
} else {
String str = conin.next();
if (str.equals("done"))
break;
else {
System.out.println("Data format error.");
return;
}
}
}
System.out.println("Average is " + sum / count);
}
}

</source>



== Scanner: hasNextBoolean() ==



<source lang="java">

/*
String: string
boolean: true
boolean: false
int: 1
int: 2
int: 3
double: 4.12
*/
import java.io.FileReader;
import java.io.FileWriter;
import java.io.IOException;
import java.util.Scanner;
public class MainClass {
public static void main(String args[]) throws IOException {
int i;
double d;
boolean b;
String str;
FileWriter fout = new FileWriter("test.txt");
fout.write("string true false 1 2 3 4.12");
fout.close();
FileReader fin = new FileReader("Test.txt");
Scanner src = new Scanner(fin);
while (src.hasNext()) {
if (src.hasNextInt()) {
i = src.nextInt();
System.out.println("int: " + i);
} else if (src.hasNextDouble()) {
d = src.nextDouble();
System.out.println("double: " + d);
} else if (src.hasNextBoolean()) {
b = src.nextBoolean();
System.out.println("boolean: " + b);
} else {
str = src.next();
System.out.println("String: " + str);
}
}
fin.close();
}
}

</source>



== Scanner: hasNextDouble() ==



<source lang="java">

/**
*Output:
*/
import java.util.Scanner;
public class MainClass {
public static void main(String args[]) {
Scanner conin = new Scanner(System.in);
int count = 0;
double sum = 0.0;
System.out.println("Enter numbers to average.");
while (conin.hasNext()) {
if (conin.hasNextDouble()) {
sum += conin.nextDouble();
count++;
} else {
String str = conin.next();
if (str.equals("done"))
break;
else {
System.out.println("Data format error.");
return;
}
}
}
System.out.println("Average is " + sum / count);
}
}

</source>



== Scanner: hasNextInt() ==



<source lang="java">

/*
String: string
boolean: true
boolean: false
int: 1
int: 2
int: 3
double: 4.12
*/
import java.io.FileReader;
import java.io.FileWriter;
import java.io.IOException;
import java.util.Scanner;
public class MainClass {
public static void main(String args[]) throws IOException {
int i;
double d;
boolean b;
String str;
FileWriter fout = new FileWriter("test.txt");
fout.write("string true false 1 2 3 4.12");
fout.close();
FileReader fin = new FileReader("Test.txt");
Scanner src = new Scanner(fin);
while (src.hasNext()) {
if (src.hasNextInt()) {
i = src.nextInt();
System.out.println("int: " + i);
} else if (src.hasNextDouble()) {
d = src.nextDouble();
System.out.println("double: " + d);
} else if (src.hasNextBoolean()) {
b = src.nextBoolean();
System.out.println("boolean: " + b);
} else {
str = src.next();
System.out.println("String: " + str);
}
}
fin.close();
}
}

</source>



== Scanner: hasNextLine() ==



<source lang="java">

import java.io.File;
import java.util.Scanner;
public class Main {
public static void main(String[] args) throws Exception{
File file = new File("data.txt");
Scanner scanner = new Scanner(file);
while (scanner.hasNextLine()) {
String line = scanner.nextLine();
System.out.println(line);
}
}
}

</source>



== Scanner: next() ==



<source lang="java">

/**
*Output:
*/
import java.util.Scanner;
public class MainClass {
public static void main(String args[]) {
Scanner conin = new Scanner(System.in);
int count = 0;
double sum = 0.0;
System.out.println("Enter numbers to average.");
while (conin.hasNext()) {
if (conin.hasNextDouble()) {
sum += conin.nextDouble();
count++;
} else {
String str = conin.next();
if (str.equals("done"))
break;
else {
System.out.println("Data format error.");
return;
}
}
}
System.out.println("Average is " + sum / count);
}
}

</source>



== Scanner: nextBoolean() ==



<source lang="java">

/*
String: string
boolean: true
boolean: false
int: 1
int: 2
int: 3
double: 4.12
*/
import java.io.FileReader;
import java.io.FileWriter;
import java.io.IOException;
import java.util.Scanner;
public class MainClass {
public static void main(String args[]) throws IOException {
int i;
double d;
boolean b;
String str;
FileWriter fout = new FileWriter("test.txt");
fout.write("string true false 1 2 3 4.12");
fout.close();
FileReader fin = new FileReader("Test.txt");
Scanner src = new Scanner(fin);
while (src.hasNext()) {
if (src.hasNextInt()) {
i = src.nextInt();
System.out.println("int: " + i);
} else if (src.hasNextDouble()) {
d = src.nextDouble();
System.out.println("double: " + d);
} else if (src.hasNextBoolean()) {
b = src.nextBoolean();
System.out.println("boolean: " + b);
} else {
str = src.next();
System.out.println("String: " + str);
}
}
fin.close();
}
}

</source>



== Scanner: nextDouble() ==



<source lang="java">

/*
String: string
boolean: true
boolean: false
int: 1
int: 2
int: 3
double: 4.12
*/
import java.io.FileReader;
import java.io.FileWriter;
import java.io.IOException;
import java.util.Scanner;
public class MainClass {
public static void main(String args[]) throws IOException {
int i;
double d;
boolean b;
String str;
FileWriter fout = new FileWriter("test.txt");
fout.write("string true false 1 2 3 4.12");
fout.close();
FileReader fin = new FileReader("Test.txt");
Scanner src = new Scanner(fin);
while (src.hasNext()) {
if (src.hasNextInt()) {
i = src.nextInt();
System.out.println("int: " + i);
} else if (src.hasNextDouble()) {
d = src.nextDouble();
System.out.println("double: " + d);
} else if (src.hasNextBoolean()) {
b = src.nextBoolean();
System.out.println("boolean: " + b);
} else {
str = src.next();
System.out.println("String: " + str);
}
}
fin.close();
}
}

</source>



== Scanner: nextInt() ==



<source lang="java">

/*
String: string
boolean: true
boolean: false
int: 1
int: 2
int: 3
double: 4.12
*/
import java.io.FileReader;
import java.io.FileWriter;
import java.io.IOException;
import java.util.Scanner;
public class MainClass {
public static void main(String args[]) throws IOException {
int i;
double d;
boolean b;
String str;
FileWriter fout = new FileWriter("test.txt");
fout.write("string true false 1 2 3 4.12");
fout.close();
FileReader fin = new FileReader("Test.txt");
Scanner src = new Scanner(fin);
while (src.hasNext()) {
if (src.hasNextInt()) {
i = src.nextInt();
System.out.println("int: " + i);
} else if (src.hasNextDouble()) {
d = src.nextDouble();
System.out.println("double: " + d);
} else if (src.hasNextBoolean()) {
b = src.nextBoolean();
System.out.println("boolean: " + b);
} else {
str = src.next();
System.out.println("String: " + str);
}
}
fin.close();
}
}

</source>



== Scanner: nextLine() ==



<source lang="java">

import java.io.File;
import java.util.Scanner;
public class Main {
public static void main(String[] args) throws Exception{
File file = new File("data.txt");
Scanner scanner = new Scanner(file);
while (scanner.hasNextLine()) {
String line = scanner.nextLine();
System.out.println(line);
}
}
}

</source>



== Scanner: useDelimiter(String pattern) ==



<source lang="java">

/*
*/
import java.io.FileReader;
import java.io.FileWriter;
import java.io.IOException;
import java.util.Scanner;
public class MainClass {
public static void main(String args[]) throws IOException {
int count = 0;
double sum = 0.0;

FileWriter fout = new FileWriter("test.txt");

fout.write("2, 3.4, 5,6, 7.4, 9.1, 10.5, done");
fout.close();

FileReader fin = new FileReader("Test.txt");

Scanner src = new Scanner(fin);

src.useDelimiter(", *");

while(src.hasNext()) {
if(src.hasNextDouble()) {
sum += src.nextDouble();
count++;
}
else {
String str = src.next();
if(str.equals("done")) break;
else {
System.out.println("File format error.");
return;
}
}
}

fin.close();
System.out.println("Average is " + sum / count);
}
}

</source>

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Java by API/java.util/Scanner - История изменений

в 17:43, 31 мая 2010

Admin: 1 версия