java.lang.NoSuchFieldException：java.lang.String - 使用的string.class.getDeclaredField（test）;

Question

package com.dev.java.string; 

import java.lang.reflect.Field; 

/** 
* @author ajay 
* 
*/ 
public class TestStringLiteral { 

    public static void main(String[] args) { 
     TestStringLiteral literal = new TestStringLiteral(); 
     String abc ="ajay"; 
     System.out.println(literal.showInternalCharArrayHashCode(abc)); 
     String bdf = "ajay"; 
     System.out.println(literal.showInternalCharArrayHashCode(bdf)); 
    } 

    private int showInternalCharArrayHashCode(String test) { 
     int value1 = 0; 
     try { 
      final Field value = String.class.getDeclaredField(test); 
      value1 = value.get(test).hashCode(); 
     } catch (NoSuchFieldException | SecurityException e) { 
      e.printStackTrace(); 
     } catch (IllegalArgumentException e) { 
      e.printStackTrace(); 
     } catch (IllegalAccessException e) { 
      e.printStackTrace(); 
     } 
     return value1; 
    } 
} 

Answer 1

take a look here

試試這個...

public static void main(String[] args) { 
    TestStringLiteral literal = new TestStringLiteral(); 
    String abc ="ajay"; 
    System.out.println(literal.showInternalCharArrayHashCode("abc",literal)); 
    String bdf = "ajay"; 
    System.out.println(literal.showInternalCharArrayHashCode("bdf", literal)); 
} 

private int showInternalCharArrayHashCode(String test, Object obj) { 
    int value1 = 0; 
    try { 
     final Field value = getClass().getDeclaredField(test); 
     value1 = value.get(obj).hashCode(); 
    } catch (NoSuchFieldException | SecurityException e) { 
     e.printStackTrace(); 
    } catch (IllegalArgumentException e) { 
     e.printStackTrace(); 
    } catch (IllegalAccessException e) { 
     e.printStackTrace(); 
    } 
    return value1; 
}