JAVA急救啊!1.System.in.skip(2);是什么意思?2.还有try,catch用来干什么的?3.（int）+ch什么意思最后那个事（int）ch

JAVA急救啊!1.System.in.skip(2);是什么意思?2.还有try,catch用来干什么的?3.（int）+ch什么意思最后那个事（int）ch java.System.out.print(); 能够通过使用import来省略System甚至是System.另外.为什么不可这样：import java.*;lang.System.in.read(); JAVA,三个数字排序,import java.util.Scanner;public class Text{public static void main(String[] args){Scanner input = new Scanner(System.in) ;System.out.print(input number1:);int number1 = input.nextInt() ;System.out.print(input number2:);int java 中System.out.println()是什么意思? JAVA里有这段 while((ch=(char)System.in.read())!=' '){ buf.append(ch); 请问!=' ' 详解下java中的BufferedReader语句如何用import java.io.*;public class BufferedReaderDemo{ public static void main(String[] args) { BufferedReader bufferedReader =new BufferedReader(new InputStreamReader(System.in)); System.out.print(请输 帮我找下哪错了啊说是Exception in thread main java.lang.Error:Unresolved compilation problem:public class Week1 {/*** @param args*/public static void main(String[] args) {// TODO Auto-generated method stubint week=1;System.out.println(wee 急救啊 各位大是请问这句话如何理解BufferedReader br=new BufferedReader(new InputStreamReader(System.in));BufferedReader br=new BufferedReader(new InputStreamReader(System.in));还有这句str=buf.readLine();本人是刚学JAVA的新手,所以请 请java大神帮忙写出一下程序的子程序.- -|| 越快越好 谢谢了.import java.util.Scanner;public class Assignment5 { // public static void main (String[] args) { Scanner console = new Scanner(System.in); int num1, num2, nu selection does not contain a main type的问题import java.util.Scanner;public class Population {private String name;private int population;private double growthRate;public void readInput(){Scanner keyboard = new Scanner(System.in);System.out.println java 中 System.out.println( sdfsdf  sdfs );  是什么意思? java中System.arraycopy(a,0,b,0, in power system,radial .. to transplant Oracle Form based system to Java web system 怎么翻译? long time = System.currentTimeMillis(); while(System.currentTimeMillis()-time < 1000 java 程序。 Java 大数相乘.Wrong answer!Problem Description In this problem,you will be concerned with intimport java.math.*;import java.util.*;public class Main{static BigInteger a,b;public static void main(String[] args){Scanner c=new Scanner(System.in);Sca 简单的java程序,谁能解释下第1,5,9行啊,为什么要用grade,第9行的用法,import java.util.*;public class Dengji{public static void main(String[] args){char grade;Scanner s=new Scanner(System.in);System.out.println(请输入一个正