数组
2015-09-17 00:00
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1. 声明一个数组(Declare an array)
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2.Java中输出一个数组(Print an array in Java)
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3.从数组中创建数组列表([b]Create an ArrayList from an array)[/b]
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4.检查数组中是否包含特定值(Check if an array contains a certain value)
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5.连接两个数组( Concatenate two arrays)
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6.声明一个数组内链(Declare an array inline )
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7.将数组元素加入到一个独立的字符串中(Joins the elements of the provided array into a single String)
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8.将数组列表转换成一个数组 (Covnert an ArrayList to an array)
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9.将数组转换成一个集合(Convert an array to a set)
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10.反向数组(Reverse an array)
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11.删除数组元素(Remove element of an array)
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1 2 3 | String[] aArray = new String[ 6 ]; String[] bArray = { "a" , "b" , "c" , "d" }; String[] cArray = new String[]{ "a" , "b" , "c" , "d" }; |
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1 2 3 4 5 6 7 8 | int [] intArray = { 1 , 2 , 4 , 3 }; String intArrayString = Arrays.toString(intArray); System.out.println(intArray); // System.out.println(intArrayString); //[1,2,4,3] |
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1 2 3 4 | String[] stringArray = { "a" , "b" , "c" , "d" , "e" }; ArrayList<String> arrayList = new ArrayList<String>Arrays.asList(stringArray)); System.out.println(arrayList); // [a,b,c,d,e] |
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1 2 3 4 | String[] stringArray = { "a" , "b" , "c" , "d" , "e" }; boolean b = Arrays.asList(stringArray).contains( "a" ); System.out.println(b); // true |
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1 2 3 4 5 | int [] intArray = { 1 , 2 , 3 , 4 , 5 }; int [] intArray2 = { 6 , 7 , 8 , 9 , 10 }; // Apache Commons Lang library int [] combinedIntArray = ArrayUtils.addAll(intArray,intArray2); |
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1 | method( new String[]{ "a" , "b" , "c" , "d" , "e" }); |
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1 2 3 4 5 6 7 | <b> // containing the provided list of elements // Apache common lang String j = StringUtils.join( new String[] { "a" , "b" , "c" }, "," ); System.out.println(j); // a,b,c</b> |
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1 2 3 4 5 6 | String[] stringArray = { "a" , "b" , "c" , "d" , "e" }; ArrayList<String> arrayList = new ArrayList<String>(Arrays.asList(stringArray)); String[] stringArr = new String[arrayList.size()]; arrayList.toArray(stringArr); for (String s : stringArr) System.out.println(s); |
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1 2 3 | Set<String> set = new HashSet<String>(Arrays.asList(stringArray)); System.out.println(set); //[d,e,b,c,a] |
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1 2 3 4 | <b> int [] intArray = { 1 , 2 , 3 , 4 , 5 }; ArrayUtils.reverse(intArray); System.out.println(Arrays.toString(intArray)); //[5,4,3,2,1]</b> |
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1 2 3 4 5 | <b> int [] intArray = { 1 , 2 , 3 , 4 , 5 }; int [] removed = ArrayUtils.removeElement(intArray, 3 ); //create a new array System.out.println(Arrays.toString(removed));</b> |
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