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Java String.getByte()用法及代碼示例

在 Java 中,getBytes() 使用指定的字符集將字符串編碼為字節序列,並將結果存儲到新的字節數組中。該函數可以通過兩種方式實現。下麵對這兩種方式進行討論:

  • getBytes()
  • getBytes(Charset charset)

讓我們討論並實現第一個用例,如下所示:

Java 字符串 getBytes()

該函數不帶參數,並使用默認字符集將字符串編碼為字節。 Java中的getbytes()函數用於將字符串轉換為字節序列並返回字節數組。

用法

public byte[] getBytes()

示例 1:

Java


// Java Program to Demonstrate
// Working of getByte() Method
// Importing required classes
import java.util.*;
// Main class
// GetByte
public class GFG {
    // Main driver method
    public static void main(String args[])
    {
        // Declaring and initializing a string
        String gfg = "Geeks for Geeks";
        // Displaying string values before conversion
        System.out.println(
            "The String before conversion is : ");
        System.out.println(gfg);
        // Converting the string into byte
        // using getBytes() method
        byte[] b = gfg.getBytes();
        // Display message only
        System.out.println(
            "The String after conversion is : ");
        // Printing converted string after conversion
        for (int i = 0; i < b.length; i++) {
            System.out.print(b[i]);
        }
    }
}
輸出
The String before conversion is : 
Geeks for Geeks
The String after conversion is : 
71101101107115321021111143271101101107115

Java String getBytes(Charset 字符集)

現在讓我們實現並接受字符集,根據該字符集在轉換為字節時必須對字符串進行編碼。定義了許多字符集,下麵討論。

用法

public byte[] getBytes(Charset charset);
  • US-ASCII:Seven-bit ASCII,又名 ISO646-US,又名 Unicode 字符集的基本拉丁語塊
  • ISO-8859-1:ISO 1 號拉丁字母,又名 ISO-LATIN-1
  • UTF-8:Eight-bit UCS 轉換格式
  • UTF-16BE:16 位 UCS 轉換格式,big-endian 字節順序
  • UTF-16LE:16 位 UCS 轉換格式,little-endian 字節順序
  • UTF-16:16 位 UCS 轉換格式,字節順序由可選的字節順序標記標識。

示例

Java


// Java code to Illustrate Working of getByte() Method
// using Different Character Sets
// Importing required classes
import java.io.*;
// Main class
public class GFG {
    // Main driver method
    public static void main(String args[])
    {
        // Declaring and initializinga string
        String gfg = new String("Geeks for Geeks");
        // Displaying string values before conversion
        System.out.println(
            "The String before conversion is : ");
        System.out.println(gfg);
        // Try block to check for exceptions
        try {
            // Converting the string into byte
            // using getBytes() method
            byte[] b = gfg.getBytes("UTF-16");
            // Displaying converted string
            // after conversion into UTF-16
            System.out.println(
                "The String after conversion into UTF-16 is : ");
            // Iterating over the string
            for (int i = 0; i < b.length; i++) {
                System.out.print(b[i]);
            }
            System.out.print("\n");
            // Converting the above string into byte
            // using getBytes() method
            byte[] c = gfg.getBytes("UTF-16BE");
            // Displaying converted string
            // after conversion into UTF-16BE
            System.out.println(
                "The String after conversion into UTF-16BE is : ");
            for (int i = 0; i < c.length; i++) {
                System.out.print(c[i]);
            }
        }
        // Catch block to handle exceptions
        catch (UnsupportedEncodingException g) {
            // Display message when exceptions occurs
            System.out.println("Unsupported character set"
                               + g);
        }
    }
}
輸出
The String before conversion is : 
Geeks for Geeks
The String after conversion into UTF-16 is : 
-2-107101010101010701150320102011101140320710101010101070115
The String after conversion into UTF-16BE is : 
07101010101010701150320102011101140320710101010101070115


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注:本文由純淨天空篩選整理自佚名大神的英文原創作品 String.getByte() Method in Java。非經特殊聲明,原始代碼版權歸原作者所有,本譯文未經允許或授權,請勿轉載或複製。