第十章----java循环练习题

package com.test;

import java.util.Arrays;

public class lianxi {
    public static void main(String[] args) {
        String str = "像勇士这样的球队,只有防守一松懈,他们才能抓住机会,"
                + "打完了三场,爵士还是没找到应对勇士的办法";
        //"球队","机会"
        System.out.println(str.indexOf("球队"));
        System.out.println(str.indexOf("机会"));
        System.out.println(str.lastIndexOf("勇士"));
        
        int m = str.indexOf("球队") + str.indexOf("机会") + str.lastIndexOf("勇士");
        System.out.println(m);
        System.out.println((char)m);
        System.out.println(str.split(",")[4]);
        
        String[] newstr = str.split("");
        String temp = "";
        for (int i = 0; i < newstr.length; i++) {
            if(newstr[i].equals("勇")) {
                newstr[i] = "爵";
            } else if(newstr[i].equals("爵")) {
                newstr[i] = "勇";
            }
            temp+=newstr[i];
        }
        System.out.println(temp);
        //勇士抓住机会,找到应对办法
        System.out.print(str.substring(str.indexOf("勇士"),str.indexOf("勇士")+2));
        System.out.print(str.substring(str.indexOf("抓住机会"),str.indexOf("抓住机会")+4));
        System.out.print(str.substring(str.indexOf(","),str.indexOf(",")+1));
        System.out.print(str.substring(str.indexOf("找到应对"),str.indexOf("找到应对")+4));
        System.out.print(str.substring(str.indexOf("办法"),str.indexOf("办法")+2));
        System.out.println();
        
        String qqEmail = "123@qq.com";
        System.out.println(qqEmail.substring(0,qqEmail.indexOf("@")));
        
        
        int n = 4;
        // 打印空心正方形
        for (int i = 0; i < n; i++) {
            if(i==0||i==n-1) {
                for (int j = 0; j < n; j++) {
                    System.out.print("A");
                }
            } else {
                for (int j = 0; j < n; j++) {
                    if(j==0||j==n-1) {
                        System.out.print("A");
                    } else {
                        System.out.print(" ");
                    }
                }
            }
            System.out.println();
        }
        System.out.println("打印菱形");
        //打印菱形
        for(int i=0;i<n;i++) {
            for(int j=0;j<n-1-i;j++) {
                System.out.print(" ");
            }
            for(int k=0;k<(2*i+1);k++) {
                System.out.print("*");
            }
            System.out.println();
        }
        for(int q=0;q<n-1;q++) {
            for(int w=0;w<q+1;w++) {
                System.out.print(" ");
            }
            for(int e=0;e<2*n-3-2*q;e++) {
                System.out.print("*");
            }
            System.out.println();
        }
        System.out.println();
        //打印空心菱形
        for(int i=0;i<n;i++) {
            for(int j=0;j<n-1-i;j++) {
                System.out.print(" ");
            }
            for(int k=0;k<(2*i+1);k++) {
                if(k==0||k==2*i) {
                    System.out.print("*");
                } else {
                    System.out.print(" ");
                }
            }
            System.out.println();
        }
        for(int q=0;q<n-1;q++) {
            for(int w=0;w<q+1;w++) {
                System.out.print(" ");
            }
            for(int e=0;e<2*n-3-2*q;e++) {
                if(e==0||e==2*n-4-2*q) {
                    System.out.print("*");
                } else {
                    System.out.print(" ");
                }
            }
            System.out.println();
        }
    }
}