空字符串（「」）如何在Java中的內存中存儲？

Question

空字符串（「」）如何在Java中的內存中存儲？

空字符串""是0的長度，那麼如何將它存儲在內存中？

Answer 1

借用此answer。該程序打印空字符串的32個字節（和字符串池中的「」爲0）。

public static void main(String... args) { 
    long free1 = free(); 
    String s = ""; 
    long free2 = free(); 
    String s2 = new String(""); 
    long free3 = free(); 
    if (free3 == free1) System.err.println("You need to use -XX:-UseTLAB"); 
    System.out.println("\"\" took " + (free1 - free2) + " bytes and new String(\"\") took " + (free2 
      - free3) + " bytes."); 
} 

private static long free() { 
    return Runtime.getRuntime().freeMemory(); 
} 

此外，請檢查此answer。