console java

控制台类format()方法 (Console Class format() method)

• format() method is available in java.io package.

  format()方法在java.io包中可用。

• format() method is used to write the formatted string to this Console with the help of the given string format and object parameters.

  format()方法用于在给定的字符串格式和对象参数的帮助下将格式化的字符串写入此控制台。

• format() method is a non-static method, it is accessible with the class object only and if we try to access the method with the class name then we will get an error.

  format()方法是一个非静态方法，只能通过类对象访问，如果尝试使用类名称访问该方法，则会收到错误消息。

• format() method may throw an exception at the time of formatting this Console.

  在格式化此控制台时， format()方法可能会引发异常。

  IllegalFormatException: This exception may throw when a given string format is not valid.

  IllegalFormatException ：如果给定的字符串格式无效，则可能引发此异常。

Syntax:

句法：

    public Console format(String frmt, Object... params);

Parameter(s):

参数：

• String frmt – represents the format string as defined in the Format string.

  字符串frmt –表示格式字符串中定义的格式字符串。

• Object... params – represents the parameters addressed by the format specifiers in the format string.

  对象...参数 –表示格式字符串中格式说明符所寻址的参数。

Return value:

返回值：

The return type of the method is Console, it returns this Console.

方法的返回类型为Console ，它将返回此Console。

Example:

例：

// Java program to demonstrate the example 
// of Console format(String frmt , Object… params)
// method of Console
import java.io.*;
public class FormatOfConsole {
public static void main(String[] args) {
try {
// Instantiates Console 
Console con = System.console();
// Define a string format for rows and columns
String frmt = "%1$15s %2$20s %3$20s%n";
// By using format() method isto format the
// the given string in rows and column
con.format(frmt, "Student_Name", "Student_Add", "Student_ph");
con.format(frmt, "Preeti", "Delhi", "9425667852");
con.format(frmt, "Rahul", "Delhi", "8871459682");
con.format(frmt, "Shreya", "Delhi", "7216589745");
con.format(frmt, "Rama", "Bangalore", "8871568492");
con.format(frmt, "Anjali", "London", "8872589261");
} catch (Exception ex) {
System.out.println(ex.toString());
}
}
}

Output

输出量

Student_Name          Student_Add           Student_ph
Preeti                Delhi           9425667852
Rahul                Delhi           8871459682
Shreya                Delhi           7216589745
Rama            Bangalore           8871568492
Anjali               London           8872589261

翻译自: https://www.includehelp.com/java/console-format-method-with-example.aspx

console java