Long a = new Long(3);
Long b = new Long(3);
System.out.println(a.equals(b));

Long a = new Long(3);
Long b = new Long(3);
System.out.println(a.longValue()==b.longValue());

package com.test;  
  
import org.apache.commons.lang.StringUtils;  
  
/** 
 * @author jsczxy2 
 *  
 */  
public class BigInt {  
      
    public static void main(String[] args) {  
        BigInt a = new BigInt("367892732043217489143432876442367892732043217489143432876442367892732043217489143432876442367892732043217489143432876442");  
        BigInt b = new BigInt("3678927329999999999999994328736789273299999999999999943287367892732043217489143432876442367892732043217489143432876442");  
        System.out.println(a.toString());  
        System.out.println(b.toString());  
        System.out.println(a.add(b));  
    }  
  
    private int[] arrayint = new int[100];  
  
    public BigInt(String num) {  
        //分解數(shù)字到int數(shù)組中  
        splitNumToArray(num);  
    }  
  
    public void splitNumToArray(String num) {  
        int j = 0;  
        StringBuffer sb = new StringBuffer();  
        //數(shù)字全部翻轉(zhuǎn)后分組截取后再翻轉(zhuǎn)回來加入int數(shù)組,這里控制數(shù)組中每一個int元素恒定為8位不超過int最大長度  
        num = new StringBuffer(num).reverse().toString();  
        for (int i = 0; i <num.length(); i++) {  
            if (i % 8 == 0) {  
                if (sb != null && !sb.toString().equals("")){  
                    arrayint[j] = Integer.valueOf(sb.reverse().toString());  
                    j++;  
                    sb = new StringBuffer();  
                }  
            }  
                sb.append(num.charAt(i));  
              
        }  
        if (sb != null) {  
            arrayint[j] = Integer.valueOf(sb.reverse().toString());  
        }  
    }  
  
    //數(shù)組從后開始打印數(shù)字,不滿8位補齊8位數(shù)字用0進(jìn)行左填充  
    public String printArray(int[] array) {  
        StringBuffer sb = new StringBuffer();  
        boolean isNotFirstInt = false;  
        for (int i = array.length-1; i >=0 ; i--) {  
            if (array[i] != 0) {  
                System.out.println(i+":"+array[i]);  
                if(isNotFirstInt && String.valueOf(array[i]).length()<8){  
                    sb.append(StringUtils.leftPad(String.valueOf(array[i]), 8,"0"));  
                }else{  
                    sb.append(array[i]);  
                    if(!isNotFirstInt)  
                        isNotFirstInt = true;  
                }  
                  
            }  
        }  
        return sb.toString();  
    }  
  
    //BigInt數(shù)字進(jìn)行加法運算  
    public String add(BigInt bigInt) {  
        int[] a = this.arrayint;  
        int[] b = bigInt.arrayint;  
        int[] result = new int[100];  
        //根據(jù)各種情況進(jìn)行結(jié)果賦值  
        for(int i=0;i<a.length;i++){  
            if(a[i]==0&&b[i]!=0){  
                result[i]=b[i];  
            }else if(a[i]!=0&&b[i]==0){  
                result[i]=a[i];  
            }else if(a[i]!=0&&b[i]!=0){  
                result[i]=a[i]+b[i];  
            }else{  
                result[i]=0;  
            }  
        }  
        //處理結(jié)果數(shù)組中超過8位的int元素的進(jìn)位,該int元素截掉1位后再把其后一個元素值加一  
        for(int i=0;i<result.length;i++){  
            if(String.valueOf(result[i]).length()>8){  
                result[i] = Integer.valueOf(String.valueOf(result[i]).substring(1));  
                result[i+1] = result[i+1] + 1;  
            }  
        }  
        return printArray(result);  
    }  
  
    //打印BigInt數(shù)字  
    @Override  
    public String toString() {  
        return printArray(arrayint);  
    }  
  
}