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陣列的長度

利用length屬性, 可取得陣列的長度, 即該陣列包含了幾位成員.

int a[]={1,2,3,4};
int b[][]={{1,2,3,4},{1,2,3,4},{1,2,3,4}};
int c[][][]={{{1,2,3,4},{1,2,3,4},{1,2,3,4}},{{1,2,3,4},{1,2,3,4},{1,2,3,4}}};


上列三個陣列長度分別為何呢?
  1. public class Ch41
  2. {
  3.     public static void main(String args[])
  4.     {
  5.         int a[]={1,2,3,4};
  6.         int b[][]={{1,2,3,4},{1,2,3,4},{1,2,3,4}};
  7.         int c[][][]={{{1,2,3,4},{1,2,3,4},{1,2,3,4}},{{1,2,3,4},{1,2,3,4},{1,2,3,4}}};
  8.         System.out.println(a.length);     //4
  9.         System.out.println(b.length);     //3
  10.         System.out.println(c.length);     //2
  11.     }
  12. }
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  1. public class Ch41
  2. {
  3.     public static void main(String args[])
  4.     {
  5.         int a[]={1,2,3,4};
  6.         int b[][]={{1,2,3,4},{1,2,3,4},{1,2,3,4}};
  7.         int c[][][]={{{1,2,3,4},{1,2,3,4},{1,2,3,4}},{{1,2,3,4},{1,2,3,4},{1,2,3,4}}};
  8.         System.out.println(a.length);     
  9.         System.out.println(b.length);   
  10.         System.out.println(c.length);     
  11.     }
  12. }
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  1. public class Ch41
  2. {
  3.     public static void main(String args[])
  4.     {
  5.         int a[]={1,2,3,4};
  6.         int b[][]={{1,2,3,4},{1,2,3,4},{1,2,3,4}};
  7.         int c[][][]={{{1,2,3,4},{1,2,3,4},{1,2,3,4}},{{1,2,3,4},{1,2,3,4},{1,2,3,4}}};
  8.         System.out.println(a.length);     
  9.         System.out.println(b.length);
  10.         System.out.println(c.length);
  11.     }
  12. }
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  1. public class Ch30
  2. {
  3.     public static void main(String args[])
  4.     {
  5.         int a[]={1,2,3,4};
  6.         int b[][]={{1,2,3,4},{1,2,3,4},{1,2,3,4}};
  7.         int c[][][]={{{1,2,3,4},{1,2,3,4},{1,2,3,4}},{{1,2,3,4},{1,2,3,4},{1,2,3,4}}};
  8.         
  9.         System.out.println(a.length);
  10.         System.out.println(b.length);
  11.         System.out.println(c.length);
  12.     }
  13. }
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  1. public class Ch01
  2. {
  3.     public static void main(String args[])
  4.     {
  5.         int a[]={1,2,3,4};
  6.         int b[][]={{1,2,3,4},{1,2,3,4},{1,2,3,4}};
  7.         int c[][][]={{{1,2,3,4},{1,2,3,4},{1,2,3,4}},{{1,2,3,4},{1,2,3,4},{1,2,3,4}}};
  8.         System.out.println(a.length);
  9.         System.out.println(b.length);
  10.         System.out.println(c.length);
  11.     }
  12. }
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  1. public class Ch34
  2. {
  3.          public static void main(String args[])
  4.     {
  5.         int a[]={1,2,3,4};
  6.         int b[][]={{1,2,3,4},{1,2,3,4},{1,2,3,4}};
  7.         int c[][][]={{{1,2,3,4},{1,2,3,4},{1,2,3,4}},{{1,2,3,4},{1,2,3,4},{1,2,3,4}}};
  8.         System.out.println(a.length);
  9.         System.out.println(b.length);
  10.         System.out.println(c.length);
  11.     }
  12. }
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  1. public class Ch30
  2. {
  3.     public static void main(String args[])
  4.     {
  5.          int a[]={1,2,3,4};
  6.          int b[][]={{1,2,3,4},{1,2,3,4},{1,2,3,4}};
  7.          int c[][][]={{{1,2,3,4},{1,2,3,4},{1,2,3,4}},{{1,2,3,4},{1,2,3,4},{1,2,3,4}}};
  8.          System.out.println(a.length);
  9.          System.out.println(b.length);
  10.          System.out.println(c.length);
  11.     }
  12. }
複製代碼

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  1. public class Ch31
  2. {
  3.     public static void main(String args[])
  4.     {
  5.         int a[]={1,2,3,4};
  6.         int b[][]={{1,2,3,4},{1,2,3,4},{1,2,3,4}};
  7.         int c[][][]={{{1,2,3,4},{1,2,3,4},{1,2,3,4}},{{1,2,3,4},{1,2,3,4},{1,2,3,4}}};
  8.         System.out.println(a.length);
  9.         System.out.println(b.length);
  10.         System.out.println(c.length);
  11.     }
  12. }
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  1. public class Ch87
  2. {
  3.     public static void main(String args[])
  4.     {
  5.         int a[]={1,2,3,4};
  6.         int b[][]={{1,2,3,4},{1,2,3,4},{1,2,3,4}};
  7.         int c[][][]={{{1,2,3,4},{1,2,3,4},{1,2,3,4}},{{1,2,3,4},{1,2,3,4},{1,2,3,4}}};
  8.         System.out.println(a.length);
  9.         System.out.println(b.length);
  10.         System.out.println(c.length);
  11.     }
  12. }
複製代碼
hahahahahahahaha

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  1. public class Ch30
  2. {
  3.    public static void main(String args[])
  4.    {
  5.       int a[]={1,2,3,4};
  6.       int b[][]={{1,2,3,4},{1,2,3,4},{1,2,3,4}};
  7.       int c[][][]={{{1,2,3,4},{1,2,3,4},{1,2,3,4}},{{1,2,3,4},{1,2,3,4},{1,2,3,4}}};
  8.       System.out.println(a.length);
  9.       System.out.println(b.length);
  10.       System.out.print(c.length);
  11.    }
  12. }
複製代碼

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  1. public class Ch30
  2. {
  3.     public static void main(String args[])
  4.     {
  5.         int a[]={1,2,3,4};
  6.         int b[][]={{1,2,3,4},{1,2,3,4},{1,2,3,4}};
  7.         int c[][][]={{{1,2,3,4},{1,2,3,4},{1,2,3,4}},{{1,2,3,4},{1,2,3,4},{1,2,3,4}}};
  8.         System.out.println(a.length);
  9.         System.out.println(b.length);
  10.         System.out.println(c.length);
  11.     }
  12. }
複製代碼
李宇澤Oscar

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  1. import java.util.Arrays;
  2. public class Ch30
  3. {
  4.     public static void main(String args[])
  5.     {
  6.          int a[]={1,2,3,4,5,6};
  7.          int b[][]={{1,2,3,4,5},{1,2,3,4,5}};
  8.          int c[][][]={{{1,2,3,4},{1,2,3,4},{1,2,3,4}},{{1,2,3,4},{1,2,3,4},{1,2,3,4}},{{1,2,3,4},{1,2,3,4},{1,2,3,4}}};

  9.          System.out.println(a.length);
  10.          System.out.println(b[1].length);
  11.          System.out.println(c[0].length);
  12.     }
  13. }
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  1. public class Ch01
  2. {
  3.     public static void main(String args[])
  4.     {
  5.         int a[]={1,2,3,4};
  6.         int b[][]={{1,2,3,4},{1,2,3,4},{1,2,3,4}};
  7.         int c[][][]={{{1,2,3,4},{1,2,3,4},{1,2,3,4}},{{1,2,3,4},{1,2,3,4},{1,2,3,4}}};
  8.         System.out.println(a.length);
  9.         System.out.println(b.length);
  10.         System.out.println(c.length);
  11.     }
  12. }
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Huang chenhao

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