Eclipse裏面 的代碼 爲了整潔 刪除以前全部 重寫了 一遍
按照順序排列好 以防不時之需 以及效率 。沒有關係 加油
public class DataDemo06 {
public static void main(String[] args){
float num = 3.0f;
System.out.println("兩個小數相乘=" + num * num);
}
}
public class DataDemo10 {
public static void main(String[] args){
int i=1;
int j=2;
System.out.println("i+j="+(i+j));
}
}
package list;
import java.awt.List;
public class list {
List l1=new LinkedList();
List l2=new LinkedList();
for(int i=0;i<=9;i++){l1.add("a"+i);
}
}
public class DataMemo09 {
public static void main(String[] args){
String str = "lixinghua";
int x = 30;
str = str + x ;
System.out.println("str="+str);
}
}
public class operatordemo03 {
public static void main(String[] args){
int x =10;
int y =3;
System.out.println(x+"+"+y+"="+(x+y));
System.out.println(x+"-"+y+"="+(x-y));
System.out.println(x+"*"+y+"="+(x*y));
System.out.println(x+"/"+y+"="+(x/y));
System.out.println(x+"%"+y+"="+(x%y));
}
}
public class operatordemo04 {
public static void main(String[] args){
System.out.println("3>1="+(3>10));
System.out.println("3<=1="+(3<=1));
System.out.println("3==1="+(3==1));
System.out.println("3!=1="+(3!=1));
}
}
public class operatordemo05 {
public static void main(String[] args){
if(5>2);
System.out.println("條件成立：5大於2");
if(true);
System.out.println("直接寫的true");
if((3+6)==(3-6));
System.out.println("這是不成立的");
}
}
public class operatordemo06 {
public static void main(String[] args){
int a=3,b=3;
int x=6,y=6;
System.out.println("a="+a);
System.out.println("\t a++="+(a++)+",a="+a);
System.out.println("b="+b);
System.out.println("\t b++"+(b++)+",b="+b);
System.out.println("x="+x);
System.out.println("\t= x++"+(x++)+",x="+x);
System.out.println("y="+y);
System.out.println("\t y++"+(y++)+",y="+y);
}
}
public class operatordemo07 {
public static void main(String[] args){
boolean a=true;
boolean b=false;
System.out.println("a||b="+(a||b));
System.out.println("a|b="+(a|b));
System.out.println("a&&b="+(a&&b));
System.out.println("a&b="+(a&b));
}
}
public class operatordemo08 {
public static void main(String[] args){
int score=50;
if((score<0)||(score>100)){
System.out.println("輸入的成績有錯誤");
if((score>40)&&(score<60));
System.out.println("準備補考吧");
}
}
}
public class operatordemo09 {
public static void main(String[] args){
int x=10/0;
System.out.println("x="+x);
}
}
public class opertordemo01 {
public static void main(String[] args){
int num =12;
System.out.println("第一次輸出="+num);
num=num-3;
System.out.println("第二次輸出="+num);
}
}
package math99;
public class math99 {
public static void main (String[] args){
for(int i = 1;i <= 9;i ++){
for(int j = 1;j <= i;j ++){
System.out.print(i+"*"+j+"="+(i*j)+"\t");
}
System.out.print("\n");
}
}
}
package question;
public class change {
public static void main(String[] args){
int a=1;
int b=2;
int temp;
temp=a;
a=b;
b=temp;
System.out.printf("a="+"a"+"\n");
System.out.printf("b="+"b");
}
}
package question;
public class manyquestions{
public static void main(String[] args){
int n;
int a,b,c;
for(n=100;n<1000;n++);{
a=n%10;
b=n/10%10;
c=n/100%10;
if(n==Math.pow(a,3)+Math.pow(b, 3)+Math.pow(c, 3));
System.out.printf(n+"");
}
}
}
package rongqi;
import java.util.Collection;
public class rongqi01 {
public static void main (String[] args){
Collection c=new HashSet();
c.add("hello");
c.add(new Name("f1","11"));
c.add(Integer(100));
c.remove("hello");
c.remove(new Integer(100));
System.out.ptintln
(c.remove(new Name("f1","11")));
System.out.ptintln(c);
}
}
package test;
public class test {
static int j;
public void m(){
int i=0;
System.out.println(i);
}
public static void main(String[] args){
int i=0;
System.out.println(i);
System.out.println(j);
boolean b=false;
if(b){
int c=0;
System.out.println("b is true");
}
System.out.println("c");
}
}
package test;
public class teststringclass04 {
public static void main(String[] args){
int j=1234567;
String sNumber=String.valueOf(j);
System.out.println
("j是"+sNumber.length()+"位數。");
String s="Mary,F,1976";
String[] sPlit=s.split(",");
for(int i=0;i<sPlit.length;i++){
System.out.println(sPlit[i]);
}
}
}
package test;
public class teststringexercise {
//輸出一個程序 輸出一個字符串中的大寫英文字母數，小寫英文字母樹以及非英文字母數
//編寫一個方法 輸出在一個字符串中 指出字符串出現的次數
void count(String s);
package rongqi;
public class Name01 {
private String firstName,lastName;
public Name01(String firstName,String lastName){
this.firstName=firstName;this.lastName=lastName;
}
public String getFirstName(){return firstName;}
public String getLastName(){return lastName;}
public String toString(){ return firstName+""+lastName;}
public boolean equals(Object obj){
if (obj instanceof Name){
Name name=(Name) obj;
return (firstName.equals(name.firstName))
(lastName.equals(name.lastName));
}
return super.equals(obj);
}
public int hashCode(){
return firstName.hashCode();
}
}
package theCotDom;
public class DotCom {
private Object stringGuess;
public String checkYouself(String stringGuess) {
return null;
}
int guess=Interger.parseInt(stringGuess);
string result="miss";
for(int cell:locationsCells){
if (guess==cell){
result="hit";
numOfHits++;
break;
}
}
if(numOfHits==locationCells.length){
result="kill";
}
System.out.println(result);
return result;
}
