publicbooleanequals(Object anObject){if(this==anObject){returntrue;}if(anObjectinstanceofString){String anotherString=(String)anObject;int n=value.length;if(n==anotherString.value.length){char v1[]=value;char v2[]=anotherString.value;int i=0;while(n--!=0){if(v1[i]!=v2[i])returnfa...
JDK常用包 lang包:核心包,使用的时候不需要导入;例如String类、Math类、System类 util包:工具包,包含工具类、集合类等,例如Array、List、set等 net包:包含网络编程的类和接口 io:包含输入、输出编程相关的类和接口 text:包含格式化相关的类和接口 sql:数据库操作包 awt和swing:图形化相关 jdk各类包概述 代码语言...
publicclassStringArrayExample{publicstaticvoidmain(String[]args){// 声明一个字符串数组,大小为5String[]fruits=newString[5];// 将元素存储到数组中fruits[0]="apple";fruits[1]="banana";fruits[2]="orange";fruits[3]="grape";fruits[4]="watermelon";// 打印数组中的元素for(Stringfruit:fruits){...
public static void main(String[] args) throws Exception { String s = "a"; ArrayList<String> array = new ArrayList<>(); int count = 0; try { while (true) { s += "a"; array.add(s); count++; } } catch (Exception e) { e.printStackTrace(); } finally { System.out.println(co...
publicstaticvoidmain(String[] args) {/** * 情景一:字符串池 * JAVA虚拟机(JVM)中存在着一个字符串池,其中保存着很多String对象; * 并且可以被共享使用,因此它提高了效率。 * 由于String类是final的,它的值一经创建就不可改变。 * 字符串池由String类维护,我们可以调用intern()方法来访问字符串池。*/St...
private static boolean stringContainsSubstring(String string, String substring) { boolean result = false; result = string.contains(substring); return result; } } Here is a sample output of above program: Enter First String: Pankaj Enter Second String: ...
3. String routine operations 1. Subscript operation In the implementation of strings, it is the underlying array that actually stores the data. Subscripting a string is essentially equivalent to subscripting the underlying array. We actually encountered subscripting operations on strings in the previous...
public class AverageFinder { public static void main(String[] args) { System.out.println("Average finder v0.1"); double avg = findAverage(args); System.out.println("The average is " + avg); } private static double findAverage(String[] input) { double result = 0; for (String s : ...
drawImage(gameover, 0, 0, null); break; } } public static void main(String[] args) { JFrame frame = new JFrame("Fly"); ShootGame game = new ShootGame(); // 面板对象 frame.add(game); // 将面板添加到JFrame中 frame.setSize(WIDTH, HEIGHT); // 设置大小 frame.setAlwaysOnTop(true...
public static void main(String[] args) { // 创建一个数组,里面可以存放300个int数据 // 格式:数据类型[] 数组名称 = new 数据类型[数组长度]; int[] arrayA = new int[300]; // 创建一个数组,能存放10个double类型的数据 double[] arrayB = new double[10]; // 创建一个数组,能存放5个字符串...