Java Integer toOctalString()方法

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Java Integer toOctalString()方法

八进制是以8为基数的数字系统,在运算中使用数字0到7。八进制广泛用于PDP-8等系统的计算,IBM大型机采用12位、24位或36位字。

Java.lang.Integer.toOctalString()方法是Java中的一个内置函数,用于返回整数参数的字符串表示,作为基数8的无符号整数。

语法

public static String toOctalString(int num)

参数: 该方法接受一个整数类型的参数 num ,该参数需要转换为字符串。

返回值: 该函数返回整数参数的字符串表示,为基数8的无符号整数。

示例

 Consider an integer a = 86 Octal output = 126Consider an integer a = 186 Octal output = 272        

下面的程序说明了Integer.toOctalString()方法的工作情况:

程序1: 对于正整数。

// Java program to demonstrate working// of Integer.toOctalString() method import java.lang.*; public class Geeks {     public static void main(String[] args)    {         int a = 527;        System.out.println("Integral Number = " + a);         // returns the string representation of the unsigned int value        // represented by the argument in octal (base 8)        System.out.println("Octal Number = " + Integer.toOctalString(a));    }}

输出

Integral Number = 527Octal Number = 1017

程序2: 对于负整数。

// Java program to demonstrate working// of Integer.toOctalString() method import java.lang.*; public class Geeks {     public static void main(String[] args)    {         int a = -51;        System.out.println("Integral Number = " + a);         // Returns the string representation of the unsigned int value        // in octal (base 8)        System.out.println("Octal Number = " + Integer.toOctalString(a));    }}

输出

Integral Number = -51Octal Number = 37777777715

程序3: 对于十进制数值或字符串:

注意: 每当十进制数字或字符串作为参数被传递时,它将返回一个错误信息,导致 类型不兼容。

// Java program to demonstrate working// of Integer.toOctalString() method import java.lang.*; public class Geeks {     public static void main(String[] args)    {         double a = 18.71;         // Returns the string representation of the unsigned int value        // in octal (base 8)        System.out.println("Octal output = " + Integer.toOctalString(a));         String b = "63";         // Returns the string representation of the unsigned int value        // in octal (base 8)        System.out.println("Octal output = " + Integer.toOctalString(a));    }}

输出

prog.java:15: error: incompatible types: possible lossy conversion from double to int        System.out.println("Octal output = " + Integer.toOctalString(a));                                                                     ^prog.java:21: error: incompatible types: possible lossy conversion from double to int        System.out.println("Octal output = " + Integer.toOctalString(a));                                                                     ^Note: Some messages have been simplified; recompile with -Xdiags:verbose to get full output2 errors 

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