return、break、continue區別以及作用范圍

package com.hangao.basic;

/**
 * @author hangao [e-mail]
 * 
 * continue 中斷當前循環的當前次，繼續當前循環的下一次（如果有），繼續執行后面的代碼
 *
 * break 中斷當前循環的所有次，不再繼續當前循環，繼續外層嵌套循環的下一次（如果有），繼續執行后面的代碼
 *
 * return 中斷所有循環,且不再執行后面的代碼
 *
 * 威力 return > break > continue
 */
public class TestBreakContinueReturn {
    public static void main(String[] args) {
        testReturn1();
        testReturn2();
        testContinue1();
        testContinue2();
        testBreak1();
        testBreak2();
    }

    /**
     * 運行結果：
     * i value is 0
     */
    private static void testReturn1() {
        for (int i = 0; i < 3; i++) {
            if (i == 1){
                return;//中斷所有循環
            }
            System.out.println("i value is " + i);
        }
        System.out.println("TestBreakContinueReturn.testReturn1()");
    }
    
    /**
     * 運行結果：
     * i value is 0
     */
    private static void testReturn2() {
        for (int j = 0; j < 3; j++) {
            for (int i = 0; i < 3; i++) {
                if (i == 1){
                    return;//中斷所有循環
                }
                System.out.println("i value is " + i);
            }
        }
        System.out.println("TestBreakContinueReturn.testReturn2()");
    }
    
    /**
     * 運行結果：
     * i value is 0
     * i value is 2
     * TestBreakContinueReturn.testContinue1()
     */
    private static void testContinue1() {
        for (int i = 0; i < 3; i++) {
            if (i == 1){
                continue;//中斷當前循環
            }
            System.out.println("i value is " + i);
        }
        System.out.println("TestBreakContinueReturn.testContinue1()");
    }
    
    /**
     * 運行結果：
     * i value is 0
     * i value is 2
     * i value is 0
     * i value is 2
     * i value is 0
     * i value is 2
     * TestBreakContinueReturn.testContinue2()
     */
    private static void testContinue2() {
        for (int j = 0; j < 3; j++) {
            for (int i = 0; i < 3; i++) {
                if (i == 1){
                    continue;//中斷當前循環
                }
                System.out.println("i value is " + i);
            }
        }
        System.out.println("TestBreakContinueReturn.testContinue2()");
    }

    /**
     * 運行結果：
     * i value is 0
     * TestBreakContinueReturn.testBreak1()
     */
    private static void testBreak1() {
        for (int i = 0; i < 3; i++) {
            if (i == 1){
                break;//中斷整個循環
            }
            System.out.println("i value is " + i);
        }
        System.out.println("TestBreakContinueReturn.testBreak1()");
    }
    
    /**
     * 運行結果：
     * i value is 0
     * i value is 0
     * i value is 0
     * TestBreakContinueReturn.testBreak2()
     */
    private static void testBreak2() {
        for (int j = 0; j < 3; j++) {
            for (int i = 0; i < 3; i++) {
                if (i == 1){
                    break;//中斷當前整個循環
                }
                System.out.println("i value is " + i);
            }
        }
        System.out.println("TestBreakContinueReturn.testBreak2()");
    }
}