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                ### 概述 java中long型為最大整數類型,對于超過long型的數據如何去表示呢.在Java的世界中,超過long型的整數已經不能被稱為整數了,它們被封裝成BigInteger對象.在BigInteger類中,實現四則運算都是方法來實現,并不是采用運算符. ### BigInteger構造器 **推薦使用字符串作為傳入構造器的參數**.要求數字格式,沒有長度限制 . ~~~ BigInteger x = new BigInteger("123456789012345678956789012345678901234567890"); System.out.println(x); //完全超過long的數值范圍了 ~~~ 打印結果 ~~~ 123456789012345678956789012345678901234567890 //這還是一個BigInteger的對象 ~~~ ### 四則運算 #### 加 ~~~ BigInteger x = new BigInteger("123456789012345678956789012345678901234567890"); BigInteger y = new BigInteger("123456789012345678956789012345678901234567890"); System.out.println(x.add(y)); ~~~ 結果 ~~~ 246913578024691357913578024691357802469135780 ~~~ #### 減 ~~~ BigInteger x = new BigInteger("123456789012345678956789012345678901234567890"); BigInteger y = new BigInteger("123456789012345678956789012345678901234567890"); System.out.println(x.subtract(y)); //x-y ~~~ 結果 ~~~ 0 ~~~ #### 乘 ~~~ multiply() ~~~ #### 除 ~~~ divide() ~~~
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