javaTestStruct/ArrayTest.java at master · zengruios/javaTestStruct · GitHub

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packagecom.zengrui.java.struct;

/**
 * @Description: 数组测试
 * @Author: zengrui
 * @CreateTime: 2019/10/28 11:39
 */
publicclassArrayTest {

privateint[] array;
privateintcapacity;
publicintsize = 0;

publicArrayTest(intcapacity) {
this.array = newint[capacity];
this.capacity = capacity;
 }

publicvoidinsertIntArray(intvalue) {
for (inti = 0; i < capacity; ++i) {
if (this.array[i] == value) {
System.out.println("hit cache: " + value);
return;
 }
 }
if (size < capacity) {
this.array[size] = value;
size ++;
System.out.println("add to cache: " + value);
 } else {
// LRU
System.out.println("expired from cache: " + this.array[0]);
System.arraycopy(this.array, 1, this.array, 0, capacity - 1);
System.out.println("add to cache: " + value);
this.array[capacity - 1] = value;
 }
 }

publicstaticvoidmain(String[] args) throwsException {
ArrayTestarrTest = newArrayTest(16);
for (inti = 1; i < 17; ++i) {
arrTest.insertIntArray(i);
 }
// 缓存命中
arrTest.insertIntArray(10);
arrTest.insertIntArray(3);
// LRU缓存淘汰
arrTest.insertIntArray(17);

// System.copy
ArrayTest[] objectArray = newArrayTest[2];
ArrayTest[] destArray = newArrayTest[2];
objectArray[0] = newArrayTest(100);
objectArray[1] = newArrayTest(200);
System.arraycopy(objectArray, 0, destArray, 0, 2);

objectArray[0].capacity = 101;
System.out.println("Finished.");
 }
}