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Java 将数组设置为指定的长度，如有必要，可将开头部分刮除或填充。

欢马劈雪

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将数组设置为指定的长度，如有必要，可将开头部分刮除或填充。

实例源码：

源代码：

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//package com.nowjava;/*from n o w j a v a . c o m*/

public class Main {

public static void main(String[] argv) throws Exception {

double[] data = new double[] { 34.45, 35.45, 36.67, 37.78, 37.0000,

37.1234, 67.2344, 68.34534, 69.87700 };

int length = 2;

System.out.println(java.util.Arrays.toString(setLengthFromEnd(data,

length)));

}

/**

* Sets an array to the specified length scraping or

* padding the beginning if necessary.

public static double[] setLengthFromEnd(double[] data, int length) {

double[] ans = new double[length];

int debut;

if (length - data.length < 0)

debut = data.length - length;

else
        /*
        nowjava - 时  代  Java 提供
        */

debut = 0;

System.arraycopy(data, debut, ans, -data.length + length + debut,

data.length - debut);

return (ans);

}

/**

* Sets an array to the specified length scraping or

* padding the beginning if necessary.

public static int[] setLengthFromEnd(int[] data, int length) {

int[] ans = new int[length];

int debut;

if (length - data.length < 0)

debut = data.length - length;

else

debut = 0;

System.arraycopy(data, debut, ans, -data.length + length + debut,

data.length - debut);

return (ans);

}

/**

* Returns a comma delimited string representing the value of the array.

public static String toString(double[] array) {

StringBuffer buf = new StringBuffer(array.length);

int i;

for (i = 0; i < array.length - 1; i++) {

buf.append(array[i]);

buf.append(',');

}

buf.append(array[i]);

return buf.toString();

}

/**

* Returns a comma delimited string representing the value of the array.

public static String toString(double[][] array) {

StringBuffer buf = new StringBuffer();

for (int k = 0; k < array.length; k++) {

buf.append(toString(array[k]));

buf.append(System.getProperty("line.separator"));

}

return buf.toString();

}

/**

* Returns a comma delimited string representing the value of the array.

public static String toString(int[] array) {

StringBuffer buf = new StringBuffer(array.length);

int i;

for (i = 0; i < array.length - 1; i++) {

buf.append(array[i]);

buf.append(',');

}
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编辑于 2020-03-26 09:23:272020-03-26 09:23:27

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