1.1 Check if a String Array contains a certain value “A”. StringArrayExample1.java package com.mkyong.core; import java.util.Arrays; import java.util.List; public class StringArrayExample1 { public static void main(String[] args) { String[] alphabet = new String[]{"A", "B", "C"}...
public class PrimitiveArrayExample1 { public static void main(String[] args) { int[] number = {1, 2, 3, 4, 5, 6, 7, 8, 9, 10}; if(contains(number, 2)){ System.out.println("Hello 2"); } } public static boolean contains(final int[] array, final int v) { boolean result ...
The array must be sorted, ifArrays.binarySearch()method is used. In this case, the array is not sorted, therefore, it should not be used. Actually, if you need to check if a value is contained in some array/collection efficiently, a sorted list or tree can do it inO(log(n))or has...
int[]array={1,2,3,4,5};booleanisSorted=checkIsSortedPrimitiveArrayWithStream(array);System.out.println(isSorted);//truepublicstaticbooleancheckIsSortedPrimitiveArrayWithStream(finalint[]array){if(array==null||array.length<=1){returntrue;}returnIntStream.range(0,array.length-1).noneMatch(i->...
if (array[i] >= 0 && array[i] <= 100 && checkCondition(array[i])) { // 满足条件的处理逻辑 System.out.println(array[i]); } } private boolean checkCondition(int num) { // 其他条件判断逻辑 return num % 2 == 0; } ``` ...
publicstaticbooleancheckArrayEqualityWithForLoop(String[]a1,String[]a2){if(a1==a2){returntrue;}if(a1==null||a2==null){returnfalse;}intn=a1.length;if(n!=a2.length){returnfalse;}for(inti=0;i<n;i++){if(!a1[i].equals(a2[i])){returnfalse;}}returntrue;} ...
* @return file contents as string; null if file does not exist */ public void readFile(File file) { InputStream is = null; OutputStream os = null; try { is = new BufferedInputStream(new FileInputStream(file)); os = new ByteArrayOutputStream(); ...
* @return 是否为数组对象,如果为{@code null} 返回false */publicstaticbooleanisArray(Object obj){if(null==obj){// throw new NullPointerException("Object check for isArray is null");returnfalse;}// 反射 获得类型returnobj.getClass().isArray();}...
privatevoidgrow(intminCapacity) {// 记录旧的lengthintoldCapacity=elementData.length;// 扩容1.5倍, 位运算符效率更高intnewCapacity=oldCapacity+ (oldCapacity>>1);// 判断是否小于需求容量if (newCapacity-minCapacity<)newCapacity=minCapacity;// 判断有没有超过最大的数组大小if (newCapacity-MAX_ARRAY_...
int[]array={1,2,3};intvalue=array[5];// 抛出 ArrayIndexOutOfBoundsException 异常处理关键字 在Java中,异常处理关键字包括try、catch、finally 和 throw。 try-catch try块用于包含可能抛出异常的代码,而catch块用于捕获并处理这些异常。一个try块可以包含多个catch块,按照它们在代码中的顺序依次匹配异常。